1A2B also called "bulls and cows". It is an old-breaking paper and pencil game.

How to play:
When the game starts, it randomly generates 4 digit numbers from number 0 to number 9, all 4 digit are different. The 4 random numbers are what you need to figure out at end of the game, every game you have 8 times to guess.

First you have to guess 4 numbers to start your supposition. After that there’s a hint for you to amend the first supposition. There are eight chances for you to amend your supposition base on the hint till you find the right answer.
If your supposition shows right number and in the right position, you will gain an A. If your supposition shows right numbers in the wrong positions, you will gain B.

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Amazing, we also include another famous puzzle game Mastermind.

Mastermind (named as ColorCode) is another challenge guessing game. If you are master of 1A2B, you should try this! You have 5 number guess way, 12 times to combine any color.

How to play:
The computer chooses a secret code, your goal is to find it, making proposals, the chosen colors and also their correct places in the code. Each proposal, computer will indicate whether the proposed colors are correct or misplaced.
A black mean same color and the same position as one of the secrect code.
A white mean same color but not the same position.

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