Bulls and Cows

This application is a computer variant of the popular game Bulls and Cows. The opponents in this variant are you and the device. You will try to guess the secret number of the device and the device will try to guess your secret number. Bulls and Cows, known also as Cows and Bulls or Pigs and Bulls is an old code-breaking paper and pencil game for two players, similar to Mastermind. It is a game with numbers that may date back a century or more. It is played by two opponents. On a sheet of paper, the players each write a 4-digit secret number. The digits must be all different. Then, in turn, the players try to guess their opponent's number who gives the number of matches.