Sudoku that explains itself.
A free sudoku for iPhone and Android. When you’re stuck, a hint walks you through the logic, one highlighted step at a time.
No account. Plays offline. In 10 languages.
This board is live. Tap a cell, then a number, or ask for a hint.
Stuck? See the reason.
Most apps just fill in the cell. Cool Sudoku shows you the deduction a strong player would make, across 10 solving techniques.
- Find the spotlight
- Collect the evidence
- Make the move
One new board a day. Same for everyone.
Easy on Monday, Hard by Friday. Solve it to keep your streak going, even in airplane mode.
- A streak freeze saves your streak if you miss a day.
- Share your time without spoiling the puzzle.
- An optional reminder in the morning.
- 36 achievements, your best times and every streak in one statistics screen.
Play it your way.
A few of the switches in the app’s settings. Try them.
-
Turn off the clock and the score.
Relax Mode: on Easy and Medium, mistakes never end the game.
-
Go big with a 12×12 board.
144 cells, with A, B and C after the 9. Or a quick 6×6 on the bus.
-
Play on a dark board at night.
Light and dark themes, both tuned so the digits stay crisp.
-
Make every digit larger.
Easier to read on a small phone. The board stays the same.
Free to play. Plus is $14.99 a year.
Plus removes the ads and adds unlimited hints, unlimited 12×12 games, every past Daily Puzzle and detailed statistics on how you improve week by week. The first week is free.
Without Plus you still get every difficulty, the 6×6 and 9×9 boards, the Daily Puzzle and the past week of them, hints with extra ones for a short ad, and a few 12×12 games.
- Yearly1 week free, then $14.99 a year$14.99
- MonthlyBilled every month$3.99
- LifetimePay once, no renewals$29.99
US prices. Prices vary by country; the app shows yours.
Good questions.
- Is Cool Sudoku free?
- Yes. Every difficulty, the 6×6 and 9×9 boards and the Daily Puzzle are free, supported by ads. Cool Sudoku Plus is optional.
- Does it work offline?
- Yes. Puzzles, the Daily Puzzle included, are generated on your phone, so you can play on a plane or in the subway.
- Do I need an account?
- No. Open the app and play. There’s no sign-up and no login.
- I’ve never played Sudoku. Is it for me?
- Yes. A short tutorial teaches the rules, you start on a small 6×6 board, and hints explain every step.
- Which phones are supported?
- iPhone with iOS 17 or later, and Android phones and tablets with Android 8.0 or later.
- How do I cancel Plus?
- Anytime, in your Apple Account or Google Play subscription settings. Cancel at least 24 hours before the period ends to avoid the next charge.
Stop guessing. Start solving.
Free on iPhone and Android. No account, no fuss.