Cows&Bulls light.

The game is intended for two players. Each of the players conceives a secret n-digit number with nonrecurring digits. The player who starts the game making the first attempt to guess the number. The turn is a n-digit number with non recurring digits reported by the competitors. The competitor says in response to how many digits were guessed no resemblance to their positions in the secret number, (aka the number of cows) and how many were guessed right up to the position in the secret number (aka the number of bulls).
Players are attempting to guess at a time. The player win the game if he guesses the secret number of the first, on the condition that he did not start the game. In opposite case his opponent is given the last chance to guess the number.
You can play against the computer or against a real competitors by using multiplayer option.