Unlimited undo and redo for edit operations
对于编辑操作的无限制撤销和还原
Unlimited undo and redo operations are allowed.
允许无限制的重复和取消操作。
It supports unlimited undo and redo, random play, a generic game engine to generate solvable puzzles, and save and reload game features.
支持无限解除和恢复，随便的话剧，产生可以解决的难题，和节省和再装比赛的一台普通的游戏引擎起重要作用。
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