Android · Puzzle game
Classic Sudoku
A little focus. A satisfying solve. Enjoy classic number puzzles at your own pace.
Get Classic Sudoku on Google PlaySee the app
Features
Three difficulty levels
Choose Easy, Medium or Hard, with puzzles checked for a unique solution and difficulty.
Visual hints
See the relevant row, column or box highlighted. Start each game with three hints; earn three more through an optional rewarded ad.
Notes & undo
Keep track of possible numbers, erase entries and undo a move while you solve.
A clear, helpful board
Spot conflicts and matching numbers. Completed rows, columns and boxes light up, and finished digits become check marks on the keypad.
Play offline & resume
Core gameplay works without internet. Your game and timer save automatically, ready for your next break.
Scores & achievements
Earn points for correct entries and completed puzzles. Track personal bests, levels, weekly goals and achievements on your device.
Daily puzzle & calendar
Play a puzzle for each available date, revisit missed days and see completed days on your calendar.
540 offline puzzles
Choose from 540 playable boards across Easy, Medium and Hard.
Flexible controls
Choose number-first input, automatic note cleanup or immediate mistake checks. Undo restores changed notes.
Calm themes
Follow your phone's light or dark mode, or choose a blue, green or plum color theme.
Progress at a glance
See daily completion, personal best times and solve milestones alongside your levels and weekly goal.
New to Sudoku?
The guided tutorial introduces rows, columns and 3×3 boxes, then helps you try a simple example. English and Chinese interfaces are supported.
Does it need an internet connection?
No connection is needed for puzzles, normal hints or local progress. Banner ads and optional rewarded ads require internet and may not always be available.
Where is my progress saved?
Scores and games are stored locally. There is no account, cloud sync or online leaderboard. Clearing app data or uninstalling may remove your progress.
Contact us
Questions, feedback or a problem with Classic Sudoku?
Please include your device model, Android version and a short description of the issue.