找出所有配对的卡片，用最少的步数完成游戏。
点击卡片可以翻开，每次可以翻开两张卡片。
1. 配对成功的卡片会变成绿色并保持翻开
2. 配对失败的卡片会自动翻回
3. 已配对的卡片不能再次点击
1. 每翻开两张卡片计为一步
2. 游戏会记录总步数和用时
找出所有8对配对卡片即可获胜。
Find all matching card pairs with the fewest moves.
Click on cards to flip them. You can flip two cards at a time.
1. Successfully matched cards turn green and stay flipped
2. Unmatched cards flip back automatically
3. Matched cards cannot be clicked again
1. Each pair of flips counts as one move
2. The game records total moves and time
Win by finding all 8 matching pairs of cards.