Fill the 9x9 grid so every row, column, and 3x3 box contains digits 1-9.

Tap an empty cell to select it (highlighted in blue).

Tap a number on the keypad to fill the selected cell.

Toggle Notes to write small candidate numbers in a cell.

Wrong entries count as mistakes. 3 mistakes ends the game.

Use hints to reveal the correct number for a cell. You have 3 hints.

Undo your last move if you made an error.