OSDev Apps
Also listed as SudokuOS on the Play Store
Sudoku
Classic Sudoku with smooth gameplay, hints, and multiple difficulty levels.
Whether you're picking up Sudoku for the first time or you're a seasoned solver, SudokuOS delivers a clean, distraction-free experience built for every level of player.
Everything you need, nothing you don't
Five difficulty levels
New User, Easy, Medium, Hard, and Expert — from learning the rules to a true master challenge.
Smart hints and notes
Get unstuck without giving everything away. Pencil in candidates just like on paper.
Undo and mistake highlighting
Take back any move instantly and catch errors before they cost you the game.
Hearts system
You get 3 chances; watch a rewarded ad to restore a heart if you want to.
Stats and achievements
Track wins, best times, and unlock achievements as you improve.
Privacy first
Progress and settings stay on your device. No account. No sign-up. Just Sudoku.
Make it yours
4 themes
5 accent colours
Sound and haptics
