Aquarium Sudoku: Brain Puzzle

Dive into Aquarium Sudoku — a calming twist on the classic 9x9 number puzzle. Every puzzle you solve catches a new fish for your aquarium. Build a daily habit, keep your streak alive, and watch your tank come to life.

WHY YOU'LL LOVE IT • Classic 9x9 Sudoku with four difficulties: Easy, Medium, Hard, Expert • A brand-new Daily Challenge every day to build your streak • Catch and collect fish for every puzzle you complete • Watch your fish grow as you collect duplicates • Unlock new tank themes as your collection grows • Smart notes, hints, mistake tracking, and auto-complete for forced cells • Relaxing sounds and a clean, distraction-free design • Plays fully offline — no account, no sign-up

THE CLASSIC PUZZLE, A REWARDING META Fill every row, column, and 3x3 box with the numbers 1 to 9. Simple to learn, endlessly engaging. Aquarium Sudoku keeps the purity of the puzzle while giving every solve a payoff: a new fish, a growing tank, a longer streak.

DAILY CHALLENGE + STREAKS Finish the Daily to keep your streak alive. Any puzzle you complete counts — play your way.

Start your collection today.