Reviewing classics and making mine sweeping games easier.

Basic	(9*9)	10 mine
Intermediate	(16*16)	40 mine
Expert	(30*16)	99 mine
Full screen	(self-adaption)	self-adaption
custom	（custom）	custom

When the size of the full screen exceeds that of the expert, the minefield density is the same as that of the expert, at 99/480=0.20625; When the size is smaller than that of the expert, the mine density decreases accordingly.

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