在游戏开始之前，在桌上将三个硬币放置成一条直线。游戏开始的时候，中间一个硬币是背面朝上，其他两个硬币是正面朝上。游戏目标是改变硬币的摆放形式，让中间一个硬币正面朝上，其他两个硬币背面朝上。-In the game before the start of the three coins on the table will be placed into a straight line. When the game started, the middle of the back of a coin is facing up, the other two coins are facing up. Game goal is to change the form of coins placed, face up to the middle of a coin, the other two coins on the back side up.