What is the last letter in spelling? Level 21 – Brain Test: Answers – is the most popular puzzle game. More than 100 million downloads. If you want to test your IQ or find out how smart you are, then feel free to start playing! This wonderful game is an opportunity to play with friends or with family. With each level, the difficulty of passing increases. Improve your intelligence and non-standard thinking with the help of the game Brain Test. The developers of this puzzle, tried to make it difficult to pass. Here you will find many levels that you will not be able to pass the first time. In this case, you can use the tips and answers from our website.