season-snow
Fill every row, column and 3×3 box with 1–9 exactly once. Given digits stay fixed. Select an empty cell, then use the number buttons or keyboard. Clear or undo to correct a digit.
Fill every row, column and 3×3 box with 1–9 exactly once. Given digits stay fixed. Select an empty cell, then use the number buttons or keyboard. Clear or undo to correct a digit.