Aquarium Sudoku: Brain Puzzle

About Aquarium Sudoku: Brain Puzzle

Aquarium Sudoku is a Sudoku puzzle game where every puzzle you solve reels in a new fish for your own aquarium.

Train your brain with classic number puzzles, build a daily habit, and fill your tank with 45 species across four rarity tiers.

FEATURES
• Classic 9×9 Sudoku with a guaranteed unique solution
• 342 graded puzzles — every board solvable by pure logic, no guessing
• Puzzles adapt to your skill as you play
• Four difficulty levels — Easy, Medium, Hard, and Expert
• Watch your catch reel in as you solve — the bar fills with every correct number
• Collect 45 species across four rarity tiers and watch them swim in your tank
• Catch of the Day — a daily puzzle, and the only place to land a UR fish
• Streak calendar — solve a puzzle each day to keep your streak alive
• Unlock new tank themes as your collection grows
• Helpful tools — pencil notes, undo, erase, and hints
• Calm sound effects and a clean, distraction-free design
• No ads and no in-app purchases
• Plays 100% offline — no account, no sign-up, no internet needed

Whether you love brain games, logic puzzles, or just a calming way to unwind, Aquarium Sudoku turns your daily number puzzle into a collection you'll want to come back to.

Solve, collect, and grow your aquarium, one puzzle at a time.