Test Your Math IQ

Improve your math quotient. Don't just measure it!

There are over 75 puzzles here, involving numbers, geometric shapes, and topology, which range from head-scratching challengers to hair-pulling bafflers. You don't need any formal mathematical training to solve these, but be warned: Using both math and logic skills, you'll stretch your brain to the limit. By the time you finish the hardest puzzle, you'll be a math genius.