Sudoku rules
Sudoku on DIGIGMA is the classic 9×9. Fill every empty cell with a digit from 1 to 9 so that each row, each column, and each 3×3 box contains 1 through 9 once.
The digits already on the board stay put. There is only one way to finish the grid. Start on Beginner. You do not need to guess.
The full rules and the first scans live on How to play Sudoku. This page does not replace that one. Play Sudoku when you want a board.