Choose a difficulty to generate a fresh puzzle.
When automatic error check is on, invalid entries are flagged red as you type. When off, use the Check Board button during a game.
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Tip: use ← Menu to leave — your game is saved and can be resumed later.
Pick a number to place it in the selected cell.
Auto-check is off — use Check Board to review the grid.
Paste an 81-cell Sudoku string, row by row. Use digits 1-9 for givens and 0 or . for empty cells.
Ending this game counts it as abandoned (no win) and resets your win streak. Progress will not be resumable.
This erases all of your entries and candidate notes. The puzzle (given numbers) stays the same and the game keeps running.