NUMS - 1A2B Guess Number Game

Puzzle game to improve your logical thinking and patience.
Gameplay:
The game will random a CODE, which is a 4 disparate numbers.
Player need to figure out the numbers.
Player can test 4 numbers one time and the game will return the result: xA yB,
the result means:
1. There are x numbers are correct in same position with the CODE.
2. There are y numbers in the CODE but not at the correct position.
Player can try more times to find out the CODE.
Player test less times to figure out the puzzle can get a higher EXP.