Guess Number 1A2B is a free Android game developed by Long Tsai. This game is a fun trivia game where the user has to guess a 4-digit number set by the host. The game is based on the host's hints given to the user in the form of ?A?B.

The game consists of the user guessing the correct 4-digit number by getting hints from the host. The hint given by the host is in the form of ?A?B. Where ?A? means the number is the same and the location is also the same, and ?B? means the number is the same but the location is not the same. This trivia game is perfect for those who love to solve puzzles and riddles.