If you're looking for a fun and challenging way to improve your math skills, then 100 Math Game is the perfect app for you. Developed by PachiraSoft, this free puzzle game is available on Android and will put your mental math abilities to the test.

The goal of the game is to reach the number 100 by combining various numbers and operators. Each level presents a new challenge with a different set of numbers and operators. The game starts off easy, but as you progress, the difficulty increases and you'll need to use your critical thinking skills to solve the puzzles.

One of the best features of 100 Math Game is that it's completely free to play with no in-app purchases required. The interface is user-friendly and the game is suitable for players of all ages. Overall, if you're looking for a fun and educational way to pass the time, then 100 Math Game is definitely worth checking out.