Guess Number (Bulls and Cows)

Input a random numbers but not duplicated
2. You will get a hint by ?A?B, A means right position and right number, B means wrong position but right number.

For example: input 1234, you got 1A1B ,
It means you got 2 numbers, but one is in right position, the other isn't.

Function:
1. 3 - 10 digits length selectable
2. 3 reminder mode
3. Rounds limit
4. You can save the game data !
5. Support the Bluetooth battle !!