Youtube tutorials & List of tutorials
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Insructions to use the tool here.
Some FAQs here.
Penpa+ Version 2.25.3, Credits
*Works only in Square Board Type, it also resets undo/redo. Answer checking if enabled, will only work with original grid size.
*Works only in Square Board Type, it also resets undo/redo
*Specify the location of the first cell of your sudoku grid and its size[optional]: