Undo / Redo

Sudoku X4 maintains a history of your moves, which you access through the undo and redo buttons. The history includes changes to the values in the cell (made by you or the Digit Assistant) and changes in your cell selection.

Sometimes you've made a mistake, or you're trying a course of action that didn't work out. Press the undo button until you're back where you want to be.
If you then decide that you didn't need to undo, use redo to put your moves back.

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