Need a hand with Aquarium Sudoku, found a bug, or have a suggestion? We read every message.
Email dev@nextad.ai and we'll get back to you. To help us help you faster, please include your device model and your iOS or Android version.
How do I play?
Fill every row, column, and 3×3 box with the numbers 1 to 9, with no repeats. Each puzzle you solve catches a fish for your aquarium. Use Notes for candidates, Hints when you're stuck, and Auto Complete when only forced cells remain.
How do streaks work?
Solving any puzzle — the Daily Challenge or a Quick Play game — once per day keeps your streak alive. Miss a full day and the streak resets to zero on your next solve.
How do I reset my progress?
Your collected fish, streaks, and settings are stored only on your device. Deleting and reinstalling the app clears all of it and starts you fresh.
Is my progress backed up or synced?
Not currently. Aquarium Sudoku needs no account and keeps everything on-device, so your progress stays private to your phone. Cloud sync is something we're considering for a future update.
Does the app cost anything?
No — Aquarium Sudoku is free to play.
I found a bug or have a feature request.
Please email dev@nextad.ai with as much detail as you can. Bug reports and ideas genuinely shape what we build next.
For details on what the app collects and how it's used, see our Privacy Policy.