QuietdokuQuietdoku for iPhone and Android
Take the quiet with you.
The app works offline and adds the parts that make a habit stick.
- Four daily puzzles, one per level
- Streaks and collectible achievement cards
- Worldwide and country rankings, seasons
- Challenge a friend with a link
- Sign in with Apple or Google to keep progress across phones
Scan to download
Free · No ads · Optional Pro for unlimited practice
Why people switch to Quietdoku
No ads. Ever.
Not between puzzles, not as a banner, not as “watch a video for a hint”. The core game stays free and ad-free for good.
It never gives the answer away
Nothing turns red while you play — not even a duplicate. Wrong cells are revealed only once the board is full, so every solve is really yours.
Hints that teach
Stuck? A hint shows the next logical step and names the technique, so next time you find it yourself.
Graded by real techniques
Every puzzle has exactly one solution and is rated by the hardest technique it needs — from naked singles to X-Wings.
Questions
Is Quietdoku really free?
Yes. The daily puzzles, rankings, achievements, hints and sync are free forever, with no ads. An optional Quietdoku Pro unlocks unlimited free play in the app.
Why are there no ads?
Because ads break concentration, and sudoku is about concentration. We would rather charge a small, optional fee than interrupt your puzzle.
Do I need an account?
No. You can play on the web and in the app without signing up. In the app you can optionally sign in with Apple or Google to keep your progress when you change phones.
Does every puzzle have a unique solution?
Yes. Every puzzle is checked by a solver to have exactly one solution, and is graded by the techniques a human needs — no guessing required.
Can I play offline?
The app works fully offline. Rankings and challenges sync the next time you are online.