Classic 9×9 Sudoku, local
DIGIGMA Sudoku is the classic 9×9: nine rows, nine columns, and nine 3×3 boxes. Put 1 through 9 in each of them. The digits already on the board stay put. There is only one way to finish the grid.
You play in a browser, on this machine. Open Sudoku from the home page. Play, leave, and Continue later. When a puzzle is solved, it sits on your Solved list. Time is private.
Start on Beginner. Look for a last empty cell, a digit that has only one place, or a cell that has only one digit left. You do not need to guess.