Bulls and Cows is an old code-breaking mind game in which you must find a number with unique digits. Bulls and Cows Game, also known as 4-digits Game, is an old code-breaking mind or paper and pencil game for one, two or more players, predating the commercially marketed board game Mastermind. Bulls and Cows offers you 5 modes : 4-digits, 5-digits, 6-digits, 7-digits and 8-digits. In each mode, you must guess a n-digits number with no duplicate digits by using digits from 0 to 9. Note that a nu