Puzzle articles
289 articles across 34 puzzles — the techniques, the strategy, and how each puzzle is built. Search them, narrow them to one section, or jump straight to a puzzle. Looking for the rules instead? Every puzzle’s rules are here.
All 289 articles, newest first inside each puzzle.
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- Daily Puzzles · 17 Sep 2026Mini Sums: How to Think Through a 5x5 Cage Puzzle
- Red-Handed · 4 Sep 2026Eliminate the Impossible: Sherlock Holmes's Method as an Actual Technique
- Red-Handed · 4 Sep 2026How to Solve Who-Is-Lying Puzzles: A Worked Example
- Red-Handed · 4 Sep 2026Puzzles Like Red-Handed: Where Else to Find Deduction With a Liar in It
- Red-Handed · 4 Sep 2026Red-Handed for Beginners: Five Mistakes That Keep You Stuck
- Red-Handed · 4 Sep 2026Red-Handed vs Logic Grid Puzzles: One Question Changes Everything
- Mini Sums: How to Think Through a 5x5 Cage PuzzleMini Sums looks like arithmetic and plays like deduction. Which cages have only one answer, why the row rule does half the work, and what to do when the grid stops moving.
- Word Ladder: How to Think in One-Letter StepsA word ladder looks like a vocabulary test and behaves more like arithmetic. Count the letters that have to change, find the ones that never move, and the chain usually appears before you type it.
- Balance: How to Think in Suns and MoonsBalance has three rules and no numbers, which makes it the daily puzzle people misjudge most. The sandwich, the counting rule, and how to break a wall without guessing.
- How the Daily Week Works: Monday to SundayOur daily puzzles get harder through the week, Monday to Sunday. What each day asks of you, how long a solve should take, and why a hard Sunday is a promise, not an accident.
- How We Make the Daily PuzzlesEvery daily board is built by one program and then checked by a second, independent one. What we test for, why we throw thousands of boards away, and why you will never have to guess.
- Mini Sudoku: How to Think Through a 6x6 GridA 6x6 sudoku is not a small 9x9. The boxes are 2x3, the maths is tighter, and the technique that cracks it is different. How to scan, when to pencil, and what to do when you stall.
- Word Trail: How to Spend Six Guesses WellSix guesses for a hidden five-letter word. Most people lose Word Trail in guess three, not guess six. How to open, when to stop chasing greens, and how to beat the repeated-letter trap.
- Are Mazes Good for Kids? The Brain and Development BenefitsAre mazes good for kids? Yes. How maze puzzles build fine motor skills, focus, problem-solving and confidence, plus how to pick the right maze by age.
- How to Make Your Own Maze: Draw a Maze Step by StepHow to make a maze by hand, step by step. A simple method to draw your own maze on paper, plus tips for making it easy or hard and adding tricky dead ends.
- How to Solve Any Maze: Strategies, Tricks and the Wall-Follower RuleLearn how to solve a maze every time. The wall-follower rule, working backward from the exit, dead-end filling, and the tricks that crack even hard mazes fast.
- How to Solve Hard Mazes Faster: Tips for AdultsTips for solving hard mazes and maze puzzles for adults. How to crack dense, large-grid mazes faster with dead-end filling, working backward, and smart scanning.
- Maze-Solving Algorithms Explained: Wall Follower, Tremaux and PledgeA plain-English guide to maze-solving algorithms: the wall follower, Tremaux's algorithm, the Pledge algorithm, dead-end filling, and how each one actually works.
- Mazes vs Labyrinths: What's the Difference?Maze vs labyrinth: the real difference between a maze and a labyrinth. One has branching paths and dead ends, the other is a single winding route. Here's how to tell them apart.
- Online Maze Games: Free Mazes You Can Play in Your BrowserPlay free online maze games right in your browser. No download, no signup. Interactive mazes across five difficulty levels you can solve online or print.
- The World's Most Famous and Hardest MazesA tour of the world's most famous mazes, from the Hampton Court hedge maze to the largest corn maze ever built, plus what makes a maze genuinely hard.
- Types of Mazes: 8 Maze Styles ExplainedA guide to the types of mazes: rectangular, circular, hexagonal, triangular, and more. How each maze style is built and what makes one harder than another.
- Chording: The Fastest Way to Clear MinesweeperChording is the speed secret of Minesweeper: click a number with both buttons to clear all its safe neighbors at once. Here's how it works and when it's safe.
- How to Flag in Minesweeper (and When Not To)How to flag in Minesweeper, and the surprising case for flagging less. Right-click flagging, when flags help, and why speedrunners barely use them.
- How to Play Minesweeper on Google, Windows, and OnlineWhere to play Minesweeper: the hidden Google game, the classic Windows version, and free online boards. How to launch each and which controls to use.
- Minesweeper Difficulty Levels Explained: Beginner to ExpertMinesweeper difficulty levels explained: Beginner 9x9, Intermediate 16x16, Expert 16x30, and beyond. Board sizes, mine counts, and which to play next.
- Minesweeper Patterns: 1-2-1, 1-2-2-1, and BeyondLearn the Minesweeper patterns that win games: the 1-1, 1-2-1, and 1-2-2-1 patterns, plus the subtraction trick. Spot them on sight and clear edges fast.
- Minesweeper Strategy: How to Win Every GameA complete Minesweeper strategy guide: open safely, read the numbers, work the edges, and learn when a guess is unavoidable. Win more games, lose fewer.
- Minesweeper World Records and How to Get FasterMinesweeper world records: the fastest Beginner, Intermediate, and Expert times ever recorded, how they're verified, and the techniques that make them possible.
- No-Guess Minesweeper and the 50/50 ProblemWhy classic Minesweeper sometimes forces a coin-flip guess, what a 50/50 is, and how no-guess Minesweeper guarantees every board is solvable by logic alone.
- The History of MinesweeperThe history of Minesweeper: from 1960s mainframe games to Microsoft bundling it with Windows in 1990, and how it became one of the most-played games ever.
- What Do the Numbers Mean in Minesweeper?What do the numbers mean in Minesweeper? Each number counts the mines touching that cell. Here's how to read them and turn them into safe, certain clicks.
- Are Nonograms Good for Your Brain? The Benefits of PicrossAre nonograms good for your brain? How solving picross puzzles exercises logic, focus, working memory and spatial reasoning, plus an honest look at what they can't do.
- How to Make Your Own NonogramHow to make your own nonogram step by step: design a picture on a grid, generate the row and column clues, and test that it has a single logical solution.
- How to Solve a 5x5 Nonogram (Step-by-Step Example)How to solve a 5x5 nonogram step by step. A complete worked example with every deduction explained, plus the overlap and X-marking habits that solve any small grid.
- How to Solve Nonograms: A Step-by-Step Guide for BeginnersLearn how to play nonograms from scratch. A beginner's guide to the rules, your first moves, and a worked example, with the overlap trick that solves most easy grids.
- Nonogram Solving Techniques: Strategies for Every GridA complete guide to nonogram solving techniques and strategy: overlap, edge logic, gap analysis, cross-referencing, and the deduction chains that crack expert grids.
- Nonogram Tips and Tricks to Solve Puzzles FasterPractical nonogram tips and tricks to solve picross puzzles faster: smart scanning order, X-marking habits, counting shortcuts, and how to get unstuck without guessing.
- Nonogram vs Picross vs Griddler: What's the Difference?Nonogram, picross, griddler, hanjie: are they the same puzzle? Yes. Here's what each name means, where it came from, and why people spell it nanogram or nonagram.
- The History of Nonograms: From Japanese Crosswords to PicrossThe history of nonograms: who invented them, how Japanese crosswords spread to newspapers worldwide, and how Nintendo's Picross made the puzzle a global hit.
- The Overlap Technique in Nonograms ExplainedThe overlap technique is the most important nonogram method. Learn the left-right slide, the (2 x clue - line length) shortcut, and how to use overlap with multiple runs.
- How to Solve the Tower of Hanoi: A Step-by-Step GuideLearn how to solve the Tower of Hanoi step by step. The rules, the recursive pattern that solves any number of disks, and a full 3-disk walkthrough with every move.
- The Legend and History of the Tower of HanoiThe history of the Tower of Hanoi: invented by Edouard Lucas in 1883, the legend of the Tower of Brahma and its 64 golden disks, and why the world is safe for now.
- The Tower of Hanoi Algorithm: Recursive and Iterative Solutions ExplainedThe Tower of Hanoi algorithm explained: the recursive solution with pseudocode, the iterative method, time complexity, and why it always takes 2^n - 1 moves.
- The Tower of Hanoi Formula: How Many Moves Does It Take? (2^n - 1)The Tower of Hanoi formula is 2^n - 1. Here's how many moves each disk count takes, why the formula works, and the famous 64-disk calculation of 585 billion years.
- Tower of Hanoi for Kids: A Simple Beginner's GuideTower of Hanoi for kids made simple. Easy rules, a 3-disk walkthrough children can follow, what it teaches, and tips for parents and teachers to introduce it.
- Tower of Hanoi in Python: A Recursive Solution with CodeTower of Hanoi in Python explained line by line. A clean recursive solution with full code and output, an iterative version, and how to count the moves.
- Tower of Hanoi Variations: 4-Peg, Cyclic, Bicolor and MoreTower of Hanoi variations explained: the 4-peg Reve's puzzle and Frame-Stewart algorithm, cyclic Hanoi, bicolor and magnetic versions, and the linear three-peg variant.
- Tower of Hanoi: 3, 4 and 5 Disk Solutions, Move by MoveComplete move-by-move Tower of Hanoi solutions for 3 disks (7 moves), 4 disks (15 moves), and 5 disks (31 moves), with the pattern that connects them all.
- What the Tower of Hanoi Teaches: Recursion and Problem-SolvingWhy the Tower of Hanoi matters: how it teaches recursion, problem decomposition, and planning, plus its real uses in computer science, math, and psychology.
- Cryptograms for Kids: Fun Secret Code PuzzlesCryptograms for kids: fun secret code puzzles that build spelling, vocabulary, and logic. How they work, how to introduce them by age, and an easy example to try.
- How to Make Your Own Cryptogram by HandHow to make your own cryptogram by hand, step by step: pick a quote, build a substitution key, encode the text, and tune the difficulty so it's fair to solve.
- How to Solve Cryptograms: A Step-by-Step GuideLearn how to solve cryptograms step by step. Use single-letter words, letter frequency, common patterns, and contractions to crack any substitution cipher quote.
- Letter Frequency Analysis: The Secret to Cracking CryptogramsLetter frequency analysis explained: the most common letters in English (ETAOIN), how to use frequency to crack cryptograms, plus bigrams, doubles, and word patterns.
- Types of Ciphers: Caesar, Substitution, and MoreA guide to the types of ciphers: Caesar, substitution, Atbash, Vigenere, transposition, and more, with how each works and which ones power cryptogram puzzles.
- What Is a Celebrity Cipher and How to Solve ItWhat is a celebrity cipher? How this famous-quote cryptogram works, why the encoded celebrity name is your best clue, and a step-by-step way to solve one.
- What Is a Cryptogram? Definition, Types, and ExamplesWhat is a cryptogram? A clear definition with examples and the main types, from cryptoquotes to celebrity ciphers, plus how these letter-substitution puzzles work.
- What Is a Cryptoquote? How It Differs from a CryptogramWhat is a cryptoquote? How this famous-quote cipher puzzle works, how it differs from a cryptogram and a cryptoquip, and how to solve the daily cryptoquote.
- What Is a Substitution Cipher? How It WorksWhat is a substitution cipher? How it works, the difference between monoalphabetic and polyalphabetic ciphers, examples like the Caesar cipher, and how to break one.
- Deduction Puzzle Tips: How to Eliminate Suspects FasterDeduction puzzle tips and strategy: eliminate suspects faster with alibi checks, timeline logic, spotting red herrings, and building airtight deduction chains.
- Deduction Puzzles for Kids: A Simple Detective GuideDeduction puzzles for kids made simple: what they are, why they build reasoning skills, how to introduce detective puzzles by age, and an easy example to solve.
- Deductive vs Inductive Reasoning: What's the Difference?Deductive vs inductive reasoning explained simply: the direction, the certainty, and clear examples of each, plus where abductive reasoning fits in.
- Detective Riddles with Answers: Can You Crack the Case?Detective riddles with answers to test your deduction. Spot the staged crime, catch the lying suspect, and crack each case with logic. Solutions included.
- How to Solve Deduction Puzzles: A Step-by-Step GuideLearn how to solve deduction puzzles step by step. Read the scenario, examine the evidence, eliminate suspects by alibi and contradiction, and name the culprit.
- How to Write Your Own Whodunit PuzzleHow to write your own whodunit puzzle step by step: pick the culprit first, build suspects and alibis, plant clues and red herrings, then test for a single solution.
- Lateral Thinking Puzzles (Situation Puzzles) with AnswersClassic lateral thinking puzzles (situation puzzles) with answers. Solve these yes-or-no brain teasers by questioning your assumptions. Solutions included.
- The Art of Deduction: How Sherlock Holmes Solves CasesThe art of deduction explained through Sherlock Holmes: how he really solves cases with observation and inference, why it's not pure deduction, and how to practice it.
- What Is Deductive Reasoning? Definition and ExamplesWhat is deductive reasoning? A clear definition with examples, the syllogism, validity vs soundness, and where deduction is used, from math proofs to detective work.
- A Logic Grid Puzzle Walkthrough: Solving One Step by StepA full logic grid puzzle example solved step by step. Watch every clue turn into a deduction, from the first direct match to the last cell, with no guessing.
- Einstein's Riddle (The Zebra Puzzle): Solve the Famous Logic PuzzleEinstein's Riddle, the famous Zebra Puzzle: the full set of clues, the question 'who owns the fish?', and a step-by-step method to solve it with a logic grid.
- How to Make Your Own Logic Grid PuzzleHow to make your own logic grid puzzle step by step: choose categories, build the solution, write clues, and test that it has a single solution with no guessing.
- How to Solve Logic Grid Puzzles: A Step-by-Step GuideLearn how to solve logic grid puzzles step by step. How the grid works, reading clues, the match-and-eliminate method, and cross-referencing, with a worked example.
- Logic Grid Puzzle Strategies: Tips and Techniques to Solve FasterLogic grid puzzle strategies that work: hidden singles, cross-referencing sub-grids, chaining conditional clues, and the negative deductions that solve hard puzzles.
- Logic Puzzles for Adults: Benefits and Best Types to TryLogic puzzles for adults: why they're worth your time, the best types to try from grid puzzles to Sudoku, and how to pick the right difficulty. Play free online.
- Logic Puzzles for Kids: A Simple Beginner's GuideLogic puzzles for kids made simple: what they are, why they build thinking skills, how to introduce them by age, and a tiny example children can solve.
- The Hardest Logic Puzzle Ever MadeThe Hardest Logic Puzzle Ever: the three-gods riddle by George Boolos, how the True/False/Random trick works, and other famously hard logic puzzles to test yourself.
- Types of Logic Puzzles ExplainedA guide to the types of logic puzzles: grid and zebra puzzles, Sudoku, nonograms, Kakuro, Slitherlink, knights and knaves, and more, with what makes each one tick.
- What Are Logic Grid Puzzles? How They Work, With ExamplesWhat is a logic grid puzzle? A clear explanation of how they work: categories, items, clues, and the elimination grid, plus a simple example and where they come from.
- How to Make Your Own Pattern PuzzleHow to make your own pattern puzzle step by step: pick a rule, build a sequence, odd-one-out, or number matrix, and test that it has a single clear answer.
- How to Solve Number Sequence Puzzles: Find the Next NumberHow to solve number sequence puzzles and find the next number. A step-by-step method using differences, ratios, and position rules, with worked examples.
- How to Solve Pattern Puzzles: A Complete GuideLearn how to solve pattern puzzles of every kind: number sequences, odd one out, and number matrices. The methods, worked examples, and what to check first.
- IQ Test Pattern and Sequence Questions ExplainedIQ test pattern and sequence questions explained: the number series, odd-one-out, and matrix types you'll face, how they're scored, and how to solve them faster.
- Number Matrix Puzzles: How to Find the Missing NumberHow to solve number matrix puzzles and find the missing number in a grid. Test rows, columns, sums, and diagonals, with worked 3x3 examples.
- Odd One Out Puzzles: How to Spot the One That Doesn't BelongHow to solve odd one out puzzles: find the shared property, then spot the item that breaks it. Method and worked examples for numbers, words, and shapes.
- Pattern Puzzles for Kids: Patterns and Sequences Made SimplePattern puzzles for kids made simple: what they are, why they build early math skills, how to introduce patterns and sequences by age, with easy examples.
- Pattern Recognition: What It Is and How to Improve ItWhat is pattern recognition? How the skill works, where it matters in daily life and work, and practical ways to improve it, including with pattern puzzles.
- Types of Number Patterns: Arithmetic, Geometric, Fibonacci & MoreA reference guide to the types of number patterns: arithmetic, geometric, square, triangular, Fibonacci, prime, and alternating sequences, each with examples.
- Visual and Shape Pattern Puzzles: How to Solve ThemHow to solve visual and shape pattern puzzles: spot rotation, reflection, added elements, and alternating rules to find which shape comes next.
- Eliminate the Impossible: Sherlock Holmes's Method as an Actual TechniqueHolmes's two famous rules, eliminate the impossible and never guess, are usually quoted as atmosphere. In a well-built deduction puzzle they are literally the solving method.
- How to Solve Who-Is-Lying Puzzles: A Worked ExampleOne statement in the set is false and you do not know which. Here is the elimination method that finds it, worked end to end on a four-suspect case.
- Puzzles Like Red-Handed: Where Else to Find Deduction With a Liar in ItIf you like deduction puzzles where somebody is lying, here is what else scratches the same itch, from knights and knaves to Murdle to classic logic grids.
- Red-Handed for Beginners: Five Mistakes That Keep You StuckNew to liar-based deduction puzzles? These are the five habits that keep beginners stuck, and what to do instead on your first few cases.
- Red-Handed vs Logic Grid Puzzles: One Question Changes EverythingBoth give you clues and ask you to work out who did what. The difference is that a logic grid's clues are all true, and one of Red-Handed's is not. Here is how that changes the solve.
- What Is a Red-Handed Puzzle? The Whodunnit Where One Statement Is a LieA Red-Handed puzzle gives you a crime, a handful of suspects, and one account that cannot be true. Here is how the deduction works, and why the liar is always the culprit.
- What Makes a Deduction Puzzle Hard? We Measured 4,500 of ThemMore suspects feels harder. We measured it across 4,500 generated cases and found the opposite: widening the cast makes a deduction puzzle easier, not harder. Here is what actually drives difficulty.
- Divisibility Rules: How to Tell What Divides a NumberDivisibility rules for 2 to 12 with examples. Quick tests to tell whether a number is divisible by 3, 4, 7, 8, 9, 11 and more, and why they help solve number puzzles.
- Magic Squares: How They Work and How to Solve OneMagic squares explained: what they are, the magic constant formula, a worked 3x3 example, the Siamese method for building odd squares, and how to solve a partial one.
- Numerical Reasoning Tests: How to Solve Number Sequence QuestionsHow to solve number sequence questions on numerical reasoning and aptitude tests. The checks that crack most series, worked examples, and timing tips for test day.
- Prime Numbers Explained: What They Are and How to Find ThemPrime numbers explained simply: what a prime number is, why 1 isn't prime, how to test if a number is prime, the Sieve of Eratosthenes, and where primes are used.
- The Collatz Conjecture: The 3n+1 Problem No One Can SolveThe Collatz conjecture explained: the simple 3n+1 rule, why the 'hailstone' numbers always seem to reach 1, worked examples, and why this easy-looking problem is unsolved.
- The Fibonacci Sequence Explained (and the Golden Ratio)The Fibonacci sequence explained: what it is, the simple rule behind it, its link to the golden ratio, where it appears in nature, and how it shows up in number puzzles.
- What Are Number Theory Puzzles? Types and How to Solve ThemWhat number theory puzzles are and how to solve them. Divisibility, prime, remainder, and digit puzzles explained, with a constraint-and-elimination solving method.
- What Is Modular Arithmetic? Clock Math Made SimpleModular arithmetic explained simply as clock math. What 'mod' means, how the modulo operation works with examples, congruence notation, and where it's used.
- Cross Number Puzzles (Crossnumbers): A Beginner's GuideWhat is a cross number puzzle (crossnumber)? How these crossword-style number puzzles work, the rules, solving tips, and how they differ from number grid puzzles.
- How to Make Your Own Number Grid PuzzleHow to make your own number grid puzzle step by step: build a valid grid of equations, blank out cells, and test for a single solution. Great for teachers and parents.
- How to Solve Number Grid Puzzles: A Step-by-Step GuideLearn how to solve number grid puzzles step by step. Fill in missing numbers and operations in arithmetic grids using one simple rule, with a full worked example.
- Math Puzzle Worksheets: A Teacher's Guide to Number GridsA teacher's guide to math puzzle worksheets using number grids. How to use them in class, differentiate by level, and where to get free printable puzzles with answer keys.
- Math Puzzles for Kids: Number Grids and Fun PracticeMath puzzles for kids that make arithmetic fun. How number grid puzzles build addition, subtraction, and times-table skills, with tips by grade and an easy example.
- Number Grid Puzzles for Adults: A Daily Math ChallengeNumber grid puzzles for adults: a quick daily math challenge that sharpens mental arithmetic and logic. How the harder grids work and where to find a real challenge.
- Number Grid vs KenKen vs Kakuro: What's the Difference?Number grid vs KenKen vs Kakuro explained. How these three arithmetic grid puzzles differ in rules, mechanics, and difficulty, and which one to try first.
- The Hundred Chart: Number Grid Patterns and ActivitiesWhat is a hundred chart? How this 1-100 number grid teaches counting, skip counting, and number patterns, with classroom activities and games for kids.
- What Is a Number Grid Puzzle? Math Operations Grids ExplainedWhat is a number grid puzzle? A clear explanation of math operations grids, how they work, the different meanings of the term, and an example to get you started.
- Anagram, Palindrome, Pangram & Acronym: Types of Wordplay ExplainedThe main types of wordplay explained: anagrams, palindromes, pangrams, acronyms, spoonerisms and more, with clear examples and how each one differs from an anagram.
- Anagrams in Books and Movies: Hidden Names and WordplayAnagrams hidden in books and movies: Voldemort's secret name, author pen names like Vivian Darkbloom, and how writers use anagrams to bury clues and identities.
- Common Anagram Word Pairs: A List of Anagrams by LengthA handy list of common anagram word pairs and groups, sorted by length from 3 to 8 letters, plus the multi-word anagrams worth knowing. Great for practice and word games.
- Famous Anagrams: The Cleverest Word Rearrangements EverThe most famous anagrams ever, clever and funny word rearrangements like LISTEN = SILENT and ASTRONOMER = MOON STARER, where the new words match the meaning.
- How to Solve Word Jumbles and Word ScramblesHow to solve word jumbles and word scrambles fast. Spot common letter patterns, work from prefixes and suffixes, separate vowels and consonants, and crack the Jumble.
- Name Anagrams: How to Find an Anagram of Your NameHow to find an anagram of your name, step by step. A simple method to rearrange the letters of your name into new words or phrases, plus famous name anagrams.
- The History of Anagrams: From Ancient Greece to Modern PuzzlesThe history of anagrams: their ancient Greek and Latin roots, mystical uses, royal anagrammatists, and how scientists like Galileo hid discoveries inside anagrams.
- Word Games Like Wordle: Anagram Puzzles and More to TryWord games like Wordle to try next: anagrams, word search, crosswords, cryptograms and more. A guide to the best word puzzles, sorted by how you actually play them.
- Do Crossword Puzzles Help Prevent Dementia? What the Research SaysAre crossword puzzles good for your brain? A clear, balanced look at the research on crosswords, memory and dementia risk — what the studies actually found, and what they didn't.
- Famous Crossword Puzzles and the Stories Behind ThemThe most famous crossword puzzles in history and the stories behind them: the D-Day crossword panic of 1944, the 1996 Election Day puzzle with two answers, and the very first grid.
- How Are Crossword Puzzles Made? Inside Crossword ConstructionHow crossword puzzles are made, step by step: grid symmetry, theme entries, filling the grid, and writing the clues. A look inside the craft of crossword construction.
- How to Get Better at Crosswords: Habits of Fast SolversWant to get better at crosswords? These are the habits that turn slow, frustrated solvers into fast ones — from working the crossings to reading clue conventions and building a daily streak.
- How to Solve Cryptic Crosswords: A Beginner's GuideA beginner's guide to solving cryptic crosswords: how the two-part clue works, the enumeration in brackets, and the main clue types — anagrams, hidden words, charades, containers and homophones.
- The History of the Crossword Puzzle: From 1913 to the New York TimesThe history of the crossword puzzle: Arthur Wynne's first 'Word-Cross' in 1913, the 1920s craze, the first crossword book, and how the New York Times finally gave in.
- What Is a Rebus Crossword? The Puzzles That Break the GridA rebus crossword squeezes multiple letters, a word, a number or a symbol into a single square. Here's what a rebus crossword is, how to spot one, and how to solve it.
- What Is Crosswordese? The Words That Appear in Every CrosswordCrosswordese is the set of odd little words that turn up in crossword after crossword. Learn what they are, why constructors use them, and a list of common crosswordese to memorise.
- Why Are Saturday Crosswords the Hardest? Crossword Difficulty by DayWhy are Saturday crosswords the hardest and Monday the easiest? How crossword difficulty by day works, what makes late-week clues tricky, and how to climb the difficulty curve.
- How to Make Your Own Word Search PuzzleHow to make your own word search puzzle step by step: pick a theme and word list, draw the grid, place the words, fill the blanks, and create an answer key.
- The History of the Word Search Puzzle: Who Invented It?The history of the word search puzzle: who invented it, the 1968 Oklahoma newspaper debut, how teachers spread it worldwide, and the earlier Spanish 'sopa de letras'.
- Word Search Fun Facts: Records, Origins, and TriviaFun facts about word search puzzles: their many names, the hidden-message variation, giant record-breaking grids, and surprising trivia about this beloved puzzle.
- Word Search Theme Ideas and Word Lists for Every OccasionWord search theme ideas and ready-made word lists for holidays, seasons, and subjects, from Christmas and Halloween to animals, food, and science. Perfect for makers.
- Word Search Tips and Strategies: How to Find Words FasterWord search tips and strategies to find hidden words faster. Scan by first letter, hunt unusual letters, check diagonals last, and clear even hard grids quickly.
- Word Search vs Crossword: Two Classic Word Puzzles ComparedWord search vs crossword: how the two classic word puzzles differ in difficulty, skills, and appeal, and which one is right for you, with a clear comparison.
- Word Searches for Seniors: A Favorite Brain-Boosting PastimeWhy word searches are a favorite activity for seniors: relaxing, accessible, and mentally engaging. Plus tips on large print, difficulty, and themes seniors enjoy.
- Word Searches in the Classroom: A Teacher's GuideA teacher's guide to using word searches in the classroom: vocabulary and spelling practice, warm-ups and sub plans, plus honest limits and how to make them more educational.
- 7 Puzzles Like Aquarium to Try NextLove the aquarium puzzle? Here are 7 logic puzzles like Aquarium, from the closest fill-to-level cousins to grid puzzles that share its count-the-clues, no-guessing feel.
- Aquarium vs Thermometers: Two Fill-to-Level Logic PuzzlesAquarium vs Thermometers: both fill cells to a level using row and column clues, but one uses tubes and the other uses regions. Here's how the two fill-to-level puzzles compare.
- Is Aquarium a Nikoli Puzzle? Where the Water Puzzle Came FromIs the aquarium puzzle a Nikoli creation like Slitherlink and Nurikabe? The honest answer: no. Here's what we actually know about where the water-filling logic puzzle came from.
- What Is an Aquarium Puzzle? (The Logic Puzzle, Not the Fish Tank)What is an aquarium puzzle? It's a grid logic puzzle where you fill regions with water to match number clues, not a fish tank. Here's how the aquarium logic puzzle works.
- What Makes an Aquarium Puzzle Hard?Why do big aquarium puzzles get so tough? The difficulty comes from the water-level rule linking columns across the grid, so one decision cascades. Here's what makes Aquarium hard.
- Why Aquarium Is the Most Beginner-Friendly Logic PuzzleNew to logic puzzles? The aquarium puzzle is the perfect place to start. Its water-filling metaphor makes the logic intuitive in a way Sudoku and other grid puzzles never manage.
- Binairo, Takuzu & Binary Puzzle: Why One Puzzle Has So Many NamesBinairo, Takuzu, Binary Puzzle, Tic-Tac-Logic, 0h h1, Unruly — they're all the same puzzle. Here's why this one logic puzzle has so many names and which name is used where.
- Binary Puzzle vs Sudoku: How Do They Compare?Binary puzzle vs Sudoku: both are grid logic puzzles, but one uses nine digits and the other just two. Here's how Binairo and Sudoku compare and which to play if you love the other.
- How Binary Puzzles Are Made (and Why They Have One Solution)How are binary puzzles (Binairo / Takuzu) made? Inside the construction process: building a valid grid from the three rules, removing cells, and guaranteeing a single logical solution.
- How to Solve a 6×6 Binary Puzzle, Step by StepA complete step-by-step walkthrough of a 6×6 binary puzzle (Binairo). Follow every forced move — pair forcing, the sandwich rule, and count completion — from the givens to the finished grid.
- How to Solve Binary Puzzles: Tips and TechniquesHow to solve binary puzzles (Binairo / Takuzu): the core techniques — pair forcing, the sandwich rule, and count completion — that crack any grid using logic alone, no guessing.
- Is Binairo Really About Binary Code? What the 0s and 1s MeanDoes the binary puzzle have anything to do with binary code or programming? No — and here's why. What the 0s and 1s in Binairo really mean, and why they could be any two symbols.
- Rule 3 Explained: Solving Binairo With Unique Rows and ColumnsBinairo's third rule — no two identical rows or columns — is the one beginners forget and experts exploit. Here's how to use the unique-lines rule to crack hard binary puzzles.
- Why Are Binairo Grids Always an Even Size?Why are Binairo (binary puzzle) grids always even-sized — 6×6, 8×8, 10×10? The answer is the equal-count rule, which only works when each row and column has an even number of cells.
- Hashi Puzzles for Kids: A Gentle Intro to Logic PuzzlesHashi puzzles for kids: a gentle, no-math logic puzzle that builds reasoning and counting. How they work, why they help, and how to introduce bridges puzzles to children.
- Hashi Strategy: Advanced Techniques for Harder Bridges PuzzlesAdvanced Hashi strategy and techniques: forced-bridge patterns, the no-isolation rule, elimination, sub-network connectivity, and chaining deductions on hard grids.
- Hashi vs Sudoku: Two Japanese Logic Puzzles ComparedHashi vs Sudoku: how these two Japanese logic puzzles compare. Rules, the kind of thinking each needs, difficulty, and which one to try based on what you enjoy.
- How to Make Your Own Hashi PuzzleHow to make your own Hashi (Bridges) puzzle step by step: build a connected bridge network, label the islands, remove the bridges, and test for a single solution.
- How to Solve Hashi Puzzles: A Step-by-Step GuideLearn how to solve Hashi (Bridges) puzzles step by step. The rules, forced bridges, the no-isolation trick, elimination, and the connectivity rule, with examples.
- Is Hashi Hard? Difficulty and How to Get BetterIs Hashi hard? How difficult the bridges puzzle really is, what makes some grids harder than others, and how to get better at Hashi, from beginner to expert.
- Japanese Logic Puzzles: A Guide to Hashi, Sudoku, Nonograms & MoreA guide to Japanese logic puzzles: Sudoku, Hashi, Nonograms, Kakuro, Slitherlink, Nurikabe and more. What each one is, how they differ, and where to play them.
- The History of Hashi and Nikoli, the Japanese Puzzle PublisherThe history of Hashi (Hashiwokakero): how the bridges puzzle was popularized by Nikoli, the Japanese publisher behind Sudoku, what its name means, and how it spread.
- What Is Hashi? Hashiwokakero and Bridges Puzzles ExplainedWhat is Hashi? Also called Hashiwokakero or Bridges, it's a Japanese logic puzzle where you connect numbered islands with bridges. Rules, names, and how it works.
- Do You Have to Guess in Hitori? What-If Reasoning ExplainedDo you have to guess in Hitori? No — a well-made Hitori is solvable by logic. Here's why, and how \"what-if\" reasoning (assume and check) is deduction, not guessing.
- Hitori vs Sudoku: The Puzzle Where You Erase, Not FillHitori vs Sudoku: both are Japanese number puzzles, but in Hitori you shade duplicates away instead of filling cells in. Here's how they compare, and whether Hitori is harder.
- How Hitori Puzzles Are Made (and Why They Have One Solution)How are Hitori puzzles made? Inside the construction process: building from a Latin square, adding duplicate numbers, and verifying a single solution that keeps white cells connected.
- Puzzles Like Hitori: Other Japanese Shading Puzzles to TryLove Hitori and want more? Here are puzzles like Hitori — Japanese shading and black-and-white logic puzzles from Nurikabe to Binairo — and what makes each a great next challenge.
- The History of Hitori: Nikoli's Number-Elimination PuzzleThe history of Hitori: how the Japanese publisher Nikoli created this number-elimination puzzle in 1990, what makes its shade-don't-fill mechanic unusual, and how it spread worldwide.
- What Does \"Hitori\" Mean? The Puzzle, the Name & the AnimeWhat does \"hitori\" mean? The Japanese word means \"alone,\" and the puzzle's full name translates to \"leave me alone.\" Here's the meaning behind the name, plus the anime mix-up.
- What Makes a Hitori Puzzle Hard?What makes a Hitori puzzle hard? Grid size, how many duplicates appear, and how deep the deduction goes all play a part. Here's what separates an easy Hitori from a brutal one.
- Why Is Hitori So Popular Around the World?Hitori is far more popular worldwide than in the US — a Japanese puzzle with a huge global following, especially in Europe. Here's why Hitori travels so well, and where to play it.
- Does Kakuro Have Only One Solution? Why You Never Have to GuessDoes a Kakuro puzzle have only one solution? Yes — and that's why you never have to guess. Here's the logic behind unique solutions and how to find the next move without guessing.
- How Kakuro Puzzles Are Made: Grids, Sums & Unique SolutionsHow are Kakuro puzzles made? A look inside cross sums construction: designing the grid, placing a valid solution, deriving the sum clues, and guaranteeing a single logical answer.
- Is Kakuro Good for Your Brain? The Logic-Plus-Math WorkoutIs Kakuro good for your brain? A balanced look at how this number puzzle exercises mental arithmetic, working memory and logic — what the benefits really are, and what they aren't.
- Kakuro vs Killer Sudoku: Two Sum Puzzles ComparedKakuro vs Killer Sudoku: both use sum clues, but they're different puzzles. Here's how the grids, rules and solving feel compare — and which sum puzzle to play first.
- Kakuro vs Sudoku: Is Kakuro Harder?Kakuro vs Sudoku compared: how the two number puzzles differ, what makes Kakuro the math-heavy cousin, and an honest answer to whether Kakuro is harder than Sudoku.
- Puzzles Like Sudoku: 7 Number Games to Try NextLove Sudoku and want something new? Here are 7 puzzles like Sudoku — number and logic games from Kakuro to KenKen — with what makes each one a great next challenge.
- The History of Kakuro: How Cross Sums Became a Japanese IconThe history of Kakuro: how the puzzle began as American 'Cross Sums' in the 1960s, was renamed by Japan's Nikoli, and rode the Sudoku boom to worldwide fame.
- What Is Cross Sums? The Number Puzzle With Two NamesWhat is Cross Sums? It's the original English name for Kakuro — the number crossword puzzle. Here's what a cross sums puzzle is, how it works, and why it has two names.
- What Makes a Kakuro Puzzle Hard? Inside the Toughest Cross SumsWhat makes a Kakuro puzzle hard? From grid size to combination scarcity and deep deduction chains, here's what separates an easy cross sums puzzle from a brutal one.
- Akari vs Light Up: The Puzzle's Two Names (and the Lamp It Isn't)Akari or Light Up? They're two names for the same Nikoli logic puzzle. Here's what 'Akari' means, why it's not the Noguchi lamp or a glowing toy, and how to find the real puzzle.
- How Light Up (Akari) Puzzles Are Made (and Why They Have One Solution)How are Light Up (Akari) puzzles made? Inside the construction process: designing the walls, placing the bulbs, deriving the numbered clues, and guaranteeing a single logical solution.
- How to Solve a 5×5 Light Up (Akari) Puzzle, Step by StepA complete step-by-step walkthrough of a 5×5 Light Up (Akari) puzzle. Follow every move — 0-walls, the 4-wall, light rays, and the no-conflict check — from the clues to the solved grid.
- How to Solve Light Up (Akari) Puzzles: Strategies and TechniquesHow to solve Light Up (Akari) puzzles: the core techniques — 0-wall and numbered-wall deductions, light-ray exclusion, and lighting the last dark cell — that crack any grid by logic.
- Is Light Up (Akari) Hard for Computers? The NP-Complete PuzzleLight Up (Akari) has famously simple rules — yet it's proven NP-complete, meaning the general puzzle is computationally hard. Here's what that means and why it doesn't stop you solving one.
- Numbered Walls in Akari: How to Solve Light Up From the CluesThe numbered walls are the heart of every Light Up (Akari) puzzle. Learn what 0, 1, 2, 3 and 4 mean, the corner and edge tricks, and how to solve Akari straight from the clues.
- The History of Akari: Nikoli's Light Up PuzzleThe history of Akari (Light Up): how the Japanese publisher Nikoli created this illumination logic puzzle, what its name means, and how it spread to the world as 'Light Up'.
- What Makes a Light Up (Akari) Puzzle Hard?What makes a Light Up (Akari) puzzle hard? Grid size, wall density, how many walls are numbered, and corridor length all play a part. Here's what separates an easy grid from a brutal one.
- Do You Have to Guess in Nurikabe?Do you have to guess in Nurikabe? No — a well-made Nurikabe is solvable by logic. Here's why, and how connectivity and the 2×2 rule force the next move when you're stuck.
- How Nurikabe Puzzles Are Made (and Why They Have One Solution)How are Nurikabe puzzles made? Inside the construction process: placing island clues, carving the sea, and verifying a single solution that stays connected and avoids 2×2 pools.
- Nurikabe Variants: Beyond the Classic Island PuzzleNurikabe has a rich family of variants — Nuribou, Mochikoro, pentomino, coded and toroidal versions. Here's a tour of the most interesting Nurikabe variations and how they change the puzzle.
- Nurikabe vs Hitori: Two Nikoli Shading Puzzles ComparedNurikabe vs Hitori: both are Nikoli shading puzzles where you blacken cells, but they work very differently. Here's how the rules, the feel, and the difficulty compare.
- Puzzles Like Nurikabe: Japanese Shading & Island PuzzlesLove Nurikabe and want more? Here are puzzles like Nurikabe — Japanese shading and region puzzles from Hitori to Nonograms — and what makes each a great next challenge.
- The History of Nurikabe: Nikoli's Island PuzzleThe history of Nurikabe: how the Japanese publisher Nikoli created this island-and-sea puzzle in 1991, what its names mean, and how it spread worldwide as a logic classic.
- What Is a Nurikabe? The Yokai Behind the PuzzleWhat does \"nurikabe\" mean? It's a yokai from Japanese folklore: an invisible wall that blocks travellers at night. Here's the spirit behind the puzzle and how the name fits.
- What Makes a Nurikabe Puzzle Hard?What makes a Nurikabe puzzle hard? Grid size, how tightly the islands are packed, and the dual sea-and-island connectivity all play a part. Here's what separates an easy grid from a brutal one.
- Is Shikaku Like Sudoku? Why It's a Rectangle Puzzle, Not a Number PuzzleIs Shikaku like Sudoku? They share a numbered grid, but they play nothing alike — in Shikaku you draw rectangles, you don't place numbers. Here's how the two puzzles really compare.
- Puzzles Like Shikaku: Grid-Division Logic PuzzlesLove Shikaku and want more? Here are puzzles like Shikaku — grid-division and region logic puzzles from Fillomino to Suguru and KenKen — and what makes each a great next challenge.
- Shikaku for Math: How a Puzzle Teaches Multiplication & FactoringShikaku is a brilliant math puzzle for kids and adults. Every clue is a factoring problem, so playing it builds multiplication, factor pairs and area skills. Here's how, and how to use it for learning.
- Shikaku Variants: Beyond the Classic Rectangle PuzzleShikaku has a family of variants that twist the classic rectangle puzzle — toroidal grids, two-number rectangles, pentomino regions and more. Here's a tour of the main Shikaku variations.
- Shikaku, Cellblocks & Rectangles: A Puzzle With Many NamesCellblocks, Rectangles, Divide by Box and Shikaku are all the same puzzle. Here's why this Nikoli puzzle has so many names, which name is used where, and how to recognise it.
- The History of Shikaku: Nikoli's \"Cut Into Squares\" PuzzleThe history of Shikaku: how a Kyoto student invented this rectangle-dividing puzzle in 1989, what its Japanese name means, and how Nikoli turned it into a worldwide classic.
- What Makes a Shikaku Puzzle Hard?What makes a Shikaku puzzle hard? Grid size, big numbers with many factorisations, and competing rectangles all play a part. Here's what separates an easy grid from a brutal one.
- How Skyscraper Puzzles Are Made (and Why They Have One Solution)How are skyscraper puzzles made? Inside the construction process: building a Latin square, deriving the visibility clues, removing clues, and guaranteeing a single logical solution.
- How to Solve a 4×4 Skyscraper Puzzle, Step by StepA complete step-by-step walkthrough of a 4×4 skyscraper puzzle. Follow every deduction from the first clue to the finished grid and learn the technique on the beginner size.
- How to Solve Skyscraper Puzzles: Strategies for Every ClueHow to solve skyscraper puzzles: clue-by-clue strategies, from the all-important 1 and N clues to cross-referencing opposite clues and using Latin-square elimination — no guessing needed.
- Skyscraper Puzzles and Spatial Reasoning: Training Your Visual LogicSkyscraper puzzles are unusually good for spatial reasoning. Here's how the visibility mechanic trains visual logic and mental imagery — and an honest look at what the benefits are.
- Skyscraper Puzzles in the Classroom: A Teacher's GuideA teacher's guide to using skyscraper puzzles in the classroom: the math and logic skills they build, how to introduce them by grade, and tips for differentiation and group work.
- Skyscrapers vs Sudoku: How the Two Logic Puzzles CompareSkyscrapers vs Sudoku: both are Latin-square logic puzzles, but they solve very differently. Here's how the grids, clues and skills compare — and which to play if you love the other.
- Sum Skyscrapers: The Variant Where the Clues Add UpSum skyscrapers is a variant where each clue is the total height of the visible buildings, not how many. Here are the sum skyscraper puzzle rules, how it differs, and why it's clever.
- What Is a Skyscraper in Sudoku? The Technique vs the PuzzleWhat is a skyscraper in Sudoku? It's a single-digit solving technique — and it's not the same as the Skyscrapers puzzle. Here's how the Sudoku skyscraper works, with the difference explained.
- Why Is It Called a Skyscraper Puzzle? The Logic of the SkylineWhy is it called a skyscraper puzzle? The numbers are buildings, the clues are city skylines, and a taller tower hides the shorter ones behind it. Here's the elegant idea behind the name.
- Do You Have to Guess in Slitherlink?Do you have to guess in Slitherlink? No — a well-made Slitherlink is always solvable by logic, thanks to the single-loop rule. Here's why, and how to find the next edge when stuck.
- How Does Slitherlink Work? Why You Draw a Loop, Not Fill in NumbersHow does Slitherlink work? Despite the numbered grid, you don't fill in numbers — you draw a single loop along the edges. Here's what the numbers mean and why it's unlike Sudoku.
- How Slitherlink Puzzles Are Made (and Why They Have One Solution)How are Slitherlink puzzles made? Inside the construction process: drawing a loop, deriving the number clues, thinning them out, and guaranteeing a single solution solvable by logic.
- Puzzles Like Slitherlink: A Guide to Loop PuzzlesLove Slitherlink and want more? Here's a guide to loop puzzles and other logic puzzles like it, from Masyu to Yajilin, and what makes the loop-puzzle family so satisfying.
- Slitherlink, Loop the Loop & Fences: A Puzzle With Many NamesSlitherlink, Loop the Loop, Fences and Takegaki are all the same loop puzzle. Here's why this Nikoli puzzle has so many names, which name is used where, and how to recognise it.
- The Graph Theory Behind Slitherlink: Loops, Edges & the Inside-Outside TrickSlitherlink is a graph theory puzzle in disguise. Here's the maths behind the loop — cycles, the inside-outside trick, and why this simple-looking puzzle is NP-complete.
- The History of Slitherlink: Nikoli's Loop PuzzleThe history of Slitherlink: how the Japanese publisher Nikoli created this loop puzzle, what its original name Takegaki means, and how it spread around the world as a logic classic.
- What Makes a Slitherlink Puzzle Hard?What makes a Slitherlink puzzle hard? Grid size, how many clues are given, and the mix of 0s and 3s all play a part. Here's what separates an easy loop puzzle from a brutal one.
- How to Get Better at Star Battle: Tips to Solve FasterWant to get better at Star Battle and solve faster? These habits — diligent marking, the right scan order, and knowing when to count — turn slow solvers into quick ones.
- How to Solve 2-Star Star Battle Puzzles: Advanced TechniquesHow to solve 2-star Star Battle puzzles: advanced techniques for two stars per row, column, and region — pair enumeration, spacing logic, and multi-line counting on the hardest grids.
- How to Solve Star Battle Puzzles: Strategies and TechniquesHow to solve Star Battle puzzles: the core techniques — no-touch elimination, line and region counting, and confinement — that crack any grid with pure logic, no guessing.
- Star Battle vs Queens: How LinkedIn's Hit Puzzle Compares to the OriginalStar Battle vs Queens: LinkedIn's Queens game is essentially a 1-star Star Battle. Here's how the two star-placement puzzles compare, and why Star Battle is the deeper original.
- Star Battle, Two Not Touch & Stars: A Puzzle With Many NamesStar Battle, Two Not Touch, Stars — they're all the same puzzle. Here's why this star-placement logic puzzle has so many names, which name is used where, and how to recognise it.
- The Counting Trick That Cracks Star Battle PuzzlesThe most powerful Star Battle technique is counting: region and line confinement. Learn how to claim a row for a region and solve hard Star Battle puzzles that elimination alone can't.
- The History of Star Battle: From Puzzle Championships to LinkedInThe history of Star Battle: a modern logic puzzle that grew up on the world puzzle championship circuit, spread through puzzle publishers, and recently went mainstream via LinkedIn.
- What Makes a Star Battle Puzzle Hard?What makes a Star Battle puzzle hard? Grid size, star count, region shapes, and deduction depth all play a part. Here's what separates an easy 1-star grid from a brutal 2-star one.
- Do You Have to Guess in Suguru? Solving by Pure LogicDo you have to guess in Suguru? No — a well-made Suguru is always solvable by logic alone. Here's why, and how to find the next move when a grid seems to leave you stuck.
- How to Solve Suguru Puzzles: Strategies and TechniquesHow to solve Suguru puzzles: the core techniques — cage completion, naked and hidden singles, and cross-cage adjacency elimination — that crack any grid by pure logic, no guessing.
- Is Suguru a Type of Sudoku?Is Suguru a type of Sudoku? It looks like one, but it isn't — Suguru has no row or column rule. Here's how Suguru and Sudoku really differ, and why the no-touching rule changes everything.
- Suguru vs KenKen: How the Two Number Puzzles CompareSuguru vs KenKen: both fill cages with numbers, but they're very different puzzles. Here's how the rules, the maths, and the solving compare — and which to play if you love the other.
- Suguru vs Killer Sudoku: What's the Difference?Suguru vs Killer Sudoku: both use cages, but one is a Sudoku variant with sums and the other is a no-touching logic puzzle. Here's how they differ and which to play.
- The History of Suguru: Who Invented It and What the Name MeansThe history of Suguru: the Japanese puzzle creator Naoki Inaba, what the name means, the Tectonic and Number Blocks aliases, and how Suguru became a British newspaper favourite.
- What Makes a Suguru Puzzle Hard?What makes a Suguru puzzle hard? Grid size, the number of given digits, and cage sizes and shapes all play a part. Here's what separates an easy Suguru from a brutal one.
- Why Is Suguru So Popular in the UK?Suguru is far more popular in the UK than anywhere else — a Japanese puzzle that became a British newspaper staple. Here's why Suguru took off in Britain, and where to play it online.
- Does Sudoku Make You Smarter? The Brain Benefits of SudokuDoes Sudoku make you smarter? An honest look at the brain benefits of Sudoku: what research suggests about memory and focus, and how to get the most from it.
- How to Solve Sudoku: A Step-by-Step Guide for BeginnersLearn how to solve Sudoku step by step. A beginner's walkthrough of the rules, your first moves, and a full worked example, with no math and no guessing.
- How to Use Pencil Marks and Candidates in SudokuHow to use pencil marks (candidates) in Sudoku: when to add them, how to notate cleanly, and how candidates unlock pairs, triples, and advanced moves.
- Naked and Hidden Singles, Pairs & Triples ExplainedThe core Sudoku techniques explained simply: naked and hidden singles, pairs, and triples. What each one looks like, how to spot it, and exactly when to use it.
- Sudoku Strategy: A Complete Guide From Basics to ExpertA complete Sudoku strategy guide: scanning, singles, pairs, and advanced techniques like X-Wing, in the order you actually need them. No guessing required.
- Sudoku Tips and Tricks to Solve Puzzles FasterPractical Sudoku tips and tricks to solve faster: smarter scanning, cleaner pencil marks, and the habits that separate quick solvers from slow ones.
- The Hardest Sudoku Puzzles Ever CreatedThe hardest Sudoku puzzles ever made, from AI Escargot to the so-called world's hardest Sudoku. What makes them brutal, and how to actually approach them.
- Types of Sudoku: 12 Popular Variations ExplainedA tour of 12 Sudoku variations: Killer, Jigsaw, Samurai, KenKen, and more. How each one differs from classic Sudoku, and where to play every type online.
- X-Wing, Swordfish & Advanced Sudoku TechniquesAdvanced Sudoku techniques explained: pointing pairs, box/line reduction, X-Wing, Swordfish, and XY-Wing. The tools for cracking expert and Einstein puzzles.
- 15 Killer Sudoku Tips and Tricks to Solve Puzzles Faster15 practical killer sudoku tips and tricks to solve faster — from locked cages and the 45 rule to combination shortcuts and the mistakes that slow you down.
- Advanced Killer Sudoku Techniques: Cage Splitting, Chains & ForcingAdvanced killer sudoku techniques for expert solvers: multi-region 45-rule splits, cage interaction chains, combination forcing, and adapted X-Wings.
- Does Killer Sudoku Require Math? What Beginners Get WrongDoes killer sudoku require math? Not really. Learn why killer sudoku is a logic puzzle with light arithmetic, and what beginners get wrong about the numbers.
- How to Solve Killer Sudoku: A Step-by-Step Guide for BeginnersLearn how to solve killer sudoku step by step. A beginner's walkthrough of cages, your first moves, and a full worked example — no math degree required.
- Killer Sudoku Strategy: The Complete Guide From Beginner to ExpertA complete killer sudoku strategy guide, from your first cage to expert innies-and-outies. Learn the 45 rule, cage combinations, and the order to apply every technique.
- Killer Sudoku vs Regular Sudoku: What's the Difference?Killer sudoku vs regular sudoku: the rules, the difficulty, and which to play. A clear comparison of cages, sums, and how the two puzzles really differ.
- Sumdoku, Sum Sudoku & Killer Sudoku: Why It Has So Many NamesSumdoku, sum sudoku, samunamupure, addition sudoku — they're all killer sudoku. Here's where each name comes from and why one puzzle ended up with so many.
- The History of Killer Sudoku: How 'Sum Number Place' Was BornThe history of killer sudoku, from its Japanese 'samunamupure' roots and Latin-square ancestry to the UK newspaper boom that gave it the killer name.
- What Is the 45 Rule in Killer Sudoku? Innies and Outies ExplainedThe 45 rule is the most powerful technique in killer sudoku. Learn what it is, how to use innies and outies, and how to crack hard grids with simple subtraction.
- How to Solve Samurai Sudoku: A Step-by-Step Guide for BeginnersLearn how to solve samurai sudoku step by step. A beginner's walkthrough of the five-grid layout, where to start, and how the shared boxes do the hard work.
- Samurai Sudoku Strategy: How to Solve Five Overlapping GridsA complete samurai sudoku strategy guide. Learn to solve five overlapping grids by exploiting the shared 3x3 boxes, in the right order, from beginner to expert.
- Samurai Sudoku Tips and Tricks to Solve FasterPractical samurai sudoku tips and tricks to solve five overlapping grids faster — from working the shared boxes to avoiding the mistakes that cause restarts.
- Samurai Sudoku vs Killer Sudoku: Which Variant Should You Try?Samurai sudoku vs killer sudoku: how the two most popular sudoku variants differ, which is harder, and which one to play based on what you enjoy.
- Samurai Sudoku vs Regular Sudoku: Is It Actually Harder?Samurai sudoku vs regular sudoku: the differences, whether it's really harder, and which to play. A clear comparison of five overlapping grids versus one.
- Sudoku Variants Explained: Samurai, Butterfly, Gattai & OverlappingA guide to overlapping sudoku variants: samurai, twin, butterfly, gattai, and multi sudoku. How each layout works and how they all relate to standard sudoku.
- The History of Samurai Sudoku: The Gattai-5 StoryThe history of samurai sudoku, from its Japanese gattai-5 origins and the 2005 sudoku boom to the overlapping-grid family it inspired. Where the 5-grid puzzle came from.
- The Overlap Trick: How Shared Boxes Crack Samurai SudokuThe shared 3x3 boxes are where samurai sudoku is won. Learn the overlap technique: how to use double-constrained cells to crack overlapping grids fast.
- What Is Samurai Sudoku? The 5-Grid Puzzle ExplainedWhat is samurai sudoku? The 5-grid sudoku explained: how five overlapping 9x9 grids fit together, why it's called 5-in-one, and how it differs from regular sudoku.
- Advanced Jigsaw Sudoku Techniques: Beyond the Law of LeftoversAdvanced jigsaw sudoku techniques for expert solvers: region-aware pairs and pointing pairs, multi-row Law of Leftovers, X-Wings across irregular regions, and chains.
- How to Solve Jigsaw Sudoku: A Step-by-Step Guide for BeginnersLearn how to solve jigsaw sudoku step by step. A beginner's walkthrough of the irregular regions, your first moves, and a full worked example — no math, no guessing.
- Jigsaw Sudoku Strategy: A Complete Guide to Solving Irregular RegionsA complete jigsaw sudoku strategy guide. Learn to solve irregular regions with the Law of Leftovers, region tracing, and the right technique order, beginner to expert.
- Jigsaw Sudoku Tips and Tricks to Solve FasterPractical jigsaw sudoku tips and tricks to solve irregular-region puzzles faster — from tracing regions to the Law of Leftovers and the mistakes that cause restarts.
- Jigsaw Sudoku vs Killer Sudoku: Which Variant Should You Try?Jigsaw sudoku vs killer sudoku: how the two popular sudoku variants differ, which is harder, and which one to play based on what kind of puzzle you enjoy.
- Jigsaw Sudoku vs Regular Sudoku: Is It Harder?Jigsaw sudoku vs regular sudoku: the difference, whether it's actually harder, and which to play. A clear comparison of irregular regions versus standard 3x3 boxes.
- Jigsaw, Squiggly, Irregular: Why This Sudoku Has Five NamesJigsaw, squiggly, irregular, nonomino, geometric — they're all the same sudoku. Here's where each name comes from and why one puzzle ended up with five of them.
- The History of Jigsaw Sudoku: From Nonominoes to Squiggly GridsThe history of jigsaw sudoku: its Latin-square and nonomino roots, the sudoku boom that launched it, and how one puzzle ended up called squiggly, irregular, and geometric.
- The Law of Leftovers: The Key Jigsaw Sudoku TechniqueThe Law of Leftovers is the signature jigsaw sudoku technique. Learn how it works, with worked examples, and use it to crack hard squiggly and irregular sudoku puzzles.
- Advanced KenKen Techniques: Beyond Basic Cage MathAdvanced KenKen techniques for expert solvers: locked digits, naked and hidden pairs, the rule of total sum, line-cage interaction, and X-Wings on big 6x6 grids.
- How to Solve KenKen: A Step-by-Step Guide for BeginnersLearn how to solve KenKen step by step. A beginner's walkthrough of cages, operations, your first moves, and a full worked 4x4 example — light math, no guessing.
- KenKen Cage Combinations: Cracking the Math in Every CageMaster KenKen cage combinations. How to turn any +, −, ×, or ÷ target into a short list of possible digits — the core skill behind fast KenKen solving.
- KenKen for Kids: Why Teachers Use It to Make Math FunKenKen for kids: why teachers use this math puzzle in the classroom, what it teaches, and how to start children on easy grids that make arithmetic genuinely fun.
- KenKen Strategy: A Complete Guide to Solving Cages and Math OperationsA complete KenKen strategy guide. Learn to solve cages and math operations in the right order — from single-cell freebies to cage combinations and elimination, beginner to expert.
- KenKen Tips and Tricks to Solve FasterPractical KenKen tips and tricks to solve faster — from single-cell freebies and cage reading to the no-repeat quirk and the mistakes that cause restarts.
- KenKen vs Sudoku: What's the Difference?KenKen vs Sudoku: the rules, the math, the difficulty, and which to play. A clear comparison of arithmetic cages versus pure number placement.
- KenKen, Calcudoku & Mathdoku: Why This Puzzle Has Different NamesKenKen, Calcudoku, Mathdoku, KenDoku — they're the same puzzle. Here's what each name means, why a trademark created the aliases, and which to look for.
- The History of KenKen: How a Math Teacher Invented ItThe history of KenKen: how Japanese math teacher Tetsuya Miyamoto invented it, the 'art of teaching without teaching,' and how it reached newspapers worldwide.
- Advanced Futoshiki Techniques: Beyond Inequality ChainsAdvanced Futoshiki techniques for expert solvers: two-way forcing, naked and hidden pairs, constraint propagation, and scaling to 7x7 and 9x9 inequality puzzles.
- Futoshiki Grid Sizes: From 4x4 to 9x9 ExplainedFutoshiki grid sizes explained, from 4x4 to 9x9. How board size changes difficulty, which size to start with, and how the inequality logic scales up.
- Futoshiki Strategy: A Complete Guide to Solving Inequality PuzzlesA complete Futoshiki strategy guide. Learn to solve inequality puzzles in the right order — from Latin square basics to inequality chains and forcing, beginner to expert.
- Futoshiki Tips and Tricks to Solve FasterPractical Futoshiki tips and tricks to solve inequality puzzles faster — from reading the arrows to chains, forcing, and the mistakes that cause restarts.
- Futoshiki vs Sudoku: Is It Really Similar?Futoshiki vs Sudoku: how the inequality puzzle compares to sudoku, whether it's harder, and which to play. A clear look at arrows versus 3x3 boxes.
- How to Solve Futoshiki: A Step-by-Step Guide for BeginnersLearn how to solve Futoshiki step by step. A beginner's walkthrough of the inequality arrows, your first moves, and a full worked 4x4 example — no math, no guessing.
- Mastering Inequality Chains: The Key Futoshiki TechniqueInequality chains are the key Futoshiki technique. Learn how runs of < and > signs force digits, with worked examples, and use them to crack hard inequality puzzles.
- The History of Futoshiki: Japan's Inequality PuzzleThe history of Futoshiki: what the Japanese name means, its Latin-square roots, how it spread after the sudoku boom, and why it's also called the greater than sudoku.
- What Is Futoshiki? The \"Greater Than Sudoku\" ExplainedWhat is Futoshiki? The 'greater than sudoku' explained: how the inequality puzzle works, what the < > signs mean, and why it has so many names.