Aquarium blog
Guides, comparisons, and origins for Aquarium fans. New here? Start with what is an aquarium puzzle, then explore the rest. Prefer to just play? Jump in below.
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.
Why Aquarium Is the Most Beginner-Friendly Logic Puzzle
New 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.
Aquarium vs Thermometers: Two Fill-to-Level Logic Puzzles
Aquarium 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.
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.
7 Puzzles Like Aquarium to Try Next
Love 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.
Is Aquarium a Nikoli Puzzle? Where the Water Puzzle Came From
Is 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.