4number is an old code-breaking paper and pencil game revealed in new shape on your mobile device. Also known as Cows and Bulls. For each game the computer will generate a 4-digit secret number. The digits will be all different. Then player should try to guess the number and the computer will answer the matches in turns till the secret number is unveiled. If the matching digits are on their right positions, they are A, the "bulls"; if on different positions, they are B, the "cows". For Example the secret number is 1984.If you try 1437, the answer will be 1A1B; try 1943, the answer will be 2A1B. Now go get 4A0B and have fun!