Code Breaker (Bulls and Cows) -- also known as 'Cows and Bulls' or 'Pigs and Bulls' or 'Bulls and Cleots'.
An old code-breaking paper and pencil game for two players, pre-dating the similar commercially marketed board game.
In this Android variant you can practice your mental code breaking skills in the 'Quick Play' section. Then challenge yourself in the 'Adventure' section, with 81 gold bars to be unlocked across 27 locked safes. There is also up to 162 gold bars hidden in Adventure.. if you can find them!
At the start of the game your Android device will randomly generate a secret number.
In this variation of the game, the secret digit number can include digits from 0-9 and duplication digits are allowed.
Using the scroll wheels, the player tries to guess the secret number. If the matching digits are on their right positions, they are 'bulls', if on different positions, they are 'cows'. Example:
Secret number: 4271
Players try: 1234
Answer: 1 bull and 2 cows. (The bull is '2', the cows are '4' and '1'.)
The secret numbers for bulls and cows are usually 4-digit-numbers, but the game can be played with 3 to 8 digit numbers (in every case it is more difficult than with 3 digits).