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Another improvement would be to auto clear adjacent squares when marking a mine.

If I marked as mine, and it is surrounded by the number 1, I would like all squares that neighbors those to be cleared automatically.

It could be triggered by double clicking the flag.

It is rare that you want to clear all the tiles that neighbors a flag itself.

Usually you want to clear all tiles that touches, let say a "1" that is already touching a flag, and you can do just that by clicking that "1".