Moo is also a an old game available on
UNIX. It is similar to the game
Mastermind.
Modified from the UNIX man page
The
computer picks a number consisting of 5
decimal digits. The player
guesses 5 digits being scored on each guess. A "cow" is a
correct digit in an
incorrect position. A "bull" is a correct digit in a correct position. The game continues until the player guesses the number (a
score of 5 bulls).