Bulls and cows

Many people know the puzzle game "Bulls and Cows" in which the players try to guess their opponent's number. Now you can play this game on your mobile device!

This implementation of the game extends its rules thanks to the game modes with numbers of different length and limitations of attempts.

Game rules

To guess a number offer your version and see how many there bulls and cows.
Cow - a digit that is in the secret number, but is not in place.
Bull - a digit in their right position.
Digits are not repeated.

Example:
Secret number: 1234
Your version: 4537
Answer: "Bulls: 1 / Cows: 1" (bull is 3 and cow is 4).