Sudoku

How to play Sudoku

I fill the 9 by 9 grid so every row, every column, and each of the nine 3 by 3 boxes holds the digits 1 to 9 with no repeats. The bold given numbers are my starting clues and I cannot change them.

I tap a blank cell to select it, then tap a number on the pad below or type 1 to 9 on my keyboard. On desktop I can also move around with the arrow keys and clear a cell with Backspace or the erase key. Cells that clash turn red so I can spot my mistakes fast.

I hit Check any time to see if I am on track, Solve if I want to reveal the answer, and New Game to start a fresh puzzle whenever I like.