Brainteasers are fun. They're a great way to pass the time ... Try this challenging shape-based quiz. Can you complete the sequence in under 90 seconds? Brainteaser of the week: Can you find ...

Sharing math puzzles, strange pi facts, and new records is all part of the fun. So to celebrate Pi Day, here's a quick quiz to test your knowledge. If you need a clue, press the yellow button.