Sudoku

Open Sudoku and start solving. Choose Easy, Medium, Hard or Expert, mark possibilities with pencil notes, and ask for a hint when you get stuck. Each hint explains a deduction before you choose whether to fill the number. All four levels, notes, undo, redo and hints are free. There is no timer pushing you to finish and no mistake limit. You can turn error marking on or off. The game works offline and saves your progress automatically. Local history records completed puzzles and the hints you used. Backup and restore in Settings let you keep a copy of your board, notes and history. Choose Black Gold or follow your phone’s light and dark appearance. A bottom banner stays clear of the board and controls. Full-screen ads are limited to puzzle completions, with no more than two in 24 hours. An optional one-time purchase removes advertising; every useful gameplay feature remains free. No account or subscription is required.

Solve Easy through Expert puzzles with free explained hints, pencil notes and undo/redo. Save your progress, review completed puzzles, and export or restore a backup from Settings.