About
Sudoku is a logic puzzle game where you fill in every row, column, and box with every digit from 1 to 9 exactly once.
How to play
- Tap a cell to select it.
- Tap a number to fill the selected cell.
- Every row, column, and 3x3 box must contain each digit from 1 to 9 without repeats.
- The board is solved when the whole grid is filled correctly.
Tips
- Easier difficulties are solved by scanning where a number can only go in a row, column, or box, and by checking cells where only one number can fit.
- Sudoku is not about what CAN go in cells; it's about what MUST go in cells. If you used to finish by guessing, you were not playing good Sudoku puzzles. Proper puzzles must be solved purely by deduction.
- Use candidates mode to add notes when you are not ready to place a final number.
Keyboard shortcuts
- Move selection
- ↑ ↓ ← →
- Skip one box
- Shift↑ ↓ ← →
- Enter digit
- 1-9
- Add candidate
- Shift1-9
- Clear cell
- Backspace
- Toggle candidate mode
- C
- Undo
- CtrlZ