Fill every row, column, and 3×3 box with the digits 1–9. Each digit appears exactly once in each region.

Controls

• Tap a cell to select it, then tap a number to place it.
• Use Notes to mark possible candidates in empty cells.
• Undo reverses your last action. Long-press Undo to redo.
• Clear removes the value. Long-press Clear to erase notes.
• Hint fills the selected cell with the correct value.
• Pause the game anytime from the header. Your progress is auto-saved.