This is the classic game of Nim. You can play the traditional game which is to take the last object and work with 4 piles with have 7 objects in the first pile, 5 in the second, 3 in the third, and 1 in the fourth pile. You can also setup the board (4 piles max, 7 objects or less per pile). You can choose who goes first, and if taking the last object or avoiding the last object wins. The computer plays an excellent game. 更新内容： 优化系统性能，体验更顺畅。