排块游戏

代码说明：

  一个简单的九宫格排块游戏：移动方块，使方块按从左到右、从上到下、从小到大顺序排列，即为成功。(A simple Nine-palace block game: moving the square, so that the square in order from left to right, from top to bottom, from small to large, is successful.)