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.