Description: UP KEY(change shape),DOWN KEY(move down),LEFT KEY(move left),RIGHT KEY(move right),END or SPACE KEY(direct to bottom),ENTER KEY(pause game);
上方向键变形，其它方向键移动方块，END或者空格键使方块直接下降到底部
Instructions: UP KEY(change shape),DOWN KEY(move down),LEFT KEY(move left),RIGHT KEY(move right),END or SPACE KEY(direct to bottom),ENTER KEY(pause game);
上方向键变形，其它方向键移动方块，END或者空格键使方块直接下降到底部
