Sudoku Offline - Classic

Classic 9x9 sudoku, fully offline. Pencil notes, smart hints, four levels, and a fresh daily puzzle. Every board has one verified solution. One purchase removes ads.

Solve the grid. Calm your mind.

Sudoku is the classic 9x9 number puzzle, built to be clean, fair, and fully offline. Fill every row, column, and 3x3 box with the digits 1 to 9. Easy to learn in seconds, deeply satisfying to master.

WHY YOU WILL STAY

• Four difficulties: Easy, Medium, Hard, and Expert, with 120 hand-verified puzzles each
• Every puzzle has exactly one solution, verified by our own solver, so a board is never ambiguous or guess-only
• A fresh Daily Challenge every day with a calendar and streaks to keep
• Pencil notes with auto-clear: place a number and it disappears from the notes of every cell that can no longer hold it
• Smart, toggleable assists: highlight the selected row, column, and box, glow matching numbers, and show how many of each digit remain
• Fully offline: play on a plane, on the subway, anywhere with no wifi
• Four hand-tuned themes: paper, slate, sepia, and midnight, all free
• Gentle haptics and satisfying sounds

MADE TO BE FAIR No timer pressure (the clock is there if you want it and hides if you do not) and no pay-to-win. A mistake limit keeps you honest, but you set it: turn it off in Settings if you just want to relax. Your first hint each puzzle is free, and you earn stars for solving with few hints and no mistakes.

ONE PURCHASE, NO MORE ADS Sudoku is free with ads. A single Remove Ads purchase makes it yours forever. No subscriptions.

Play in 33 languages. Your progress stays on your device.

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