Sudoku Nine: Classic Puzzle

Sudoku Nine is a classic sudoku game with nothing in the way. No clutter, no timers you did not ask for — just good puzzles and controls that stay out of your hands.

Tap a cell, pick a number. Fill every row, column and 3x3 box with 1 to 9. Ten seconds to learn, and as deep as you want it to be.

8,651 PUZZLES, ALL VERIFIED
Easy, Medium, Hard, Expert and Extreme. Every puzzle has been checked to have exactly one solution, so you are never stuck on a broken board. Extreme is a separate set for players who want it: logic alone will not crack these, you need the advanced techniques.

DAILY CHALLENGE
One puzzle a day, marked on a calendar. Finish a whole month and the monthly cup lights up.

SYMMETRIC PUZZLES
1,267 puzzles whose given cells are symmetric around the centre — the board itself is worth looking at. No mistake limit in this mode, so you can just play.

CONTROLS THAT GET OUT OF THE WAY
Notes mode, undo, and hints that explain why a number goes where it goes instead of just filling it in. Correct entries clear matching notes in the same row, column and box automatically. Prefer number-first input? Long-press a number to lock it and keep tapping cells.

SEE YOUR PROGRESS
Win rate, best time, current streak and flawless wins, tracked per difficulty. 20 achievements to light up along the way.

PLAYS FULLY OFFLINE
Every puzzle ships inside the app. No account, no sign-up, no connection needed — on a plane or underground it works the same.

Light and dark themes, notch and full-screen displays handled, and the interface is available in English, Simplified Chinese, Traditional Chinese, Japanese and Korean.

Sudoku Nine is free and supported by ads. There are no banner ads anywhere in the app and never an ad during a puzzle. If you want an extra hint or a second chance after three mistakes, you can watch a short video — that is always your choice.