Brainie is big on mental power, and he wants to help you train your brain to think fast. He's challenged you to do arithmetic problems as fast as you can using the number blocks he drops into his head. Your goal is to keep the head from filling up with numbers. To clear them from the screen, click on numbers that will combine to create the target number. Numbers are added unless there is an operation symbol before them. Earn a high score by clearing many blocks at once or building your arithmetical sequence with number blocks of a single color.