What is brain test 42?

As an AI language model, I don't have any specific information about a Brain Test 42. However, if you are referring to a popular puzzle game called "Brain Test: Tricky Puzzles", it is a game designed to challenge the cognitive skills of players with a series of tricky and mind-bending puzzles. In the game, players are presented with visual and logical challenges that require creativity, problem-solving, and critical thinking to solve. The objective of the game is to complete all the levels and earn a perfect score by solving each puzzle as quickly and accurately as possible. The game is available for both Android and iOS platforms and has gained popularity among users worldwide.