Bulls and Cows

你喜欢挑战的精神，那么这个游戏很适合你。

Bulls and Cows (also known as Cows and Bulls or Pigs and Bulls or Bulls and Cleots or Pico and Fama or Picas and Fijas) is an old code-breaking mind or paper and pencil game for two or more players, predating the commercially marketed board game Mastermind.

It is a game that may date back a century or more which uses numbers or words. It is played by two opponents.

You will have to use your intelligence and with a bit of luck you will guess the number of your opponent, you can play it against the computer or against another player.