Sudoku
Fill the grid so every row, column and box has one to nine.
How to use it
- Click a cell, then type a number (1-9) or use the number pad to fill it in. Backspace or Erase clears a cell.
- Arrow keys move the selection. Fill every row, column and 3x3 box with 1-9 and no repeats.
- Pick a difficulty first. Use Hint if you're stuck — it reveals one cell for free but doesn't count as a mistake.