Crazy Hard Math - Ultimate Challenge Exam

Crazy Hard Math Challenge - You get it? An infinite number of math calculations await you, 2 buttons, right or wrong, and a very short amount of time.
Race the clock to get a high score, take the easy, normal or hard option, it's your choice, but with 3 different leaderboards, why not prove to your friends who is the king of math?

It really doesn't get much harder than this! Are you up for the challenge?