About

This site is a compilation of interesting mathematical brain teasers.

A few disclaimers:

• I try to give credit to the source of the brain teaser on the question page. If you think I didn’t give credit where credit is due, just email me and I’ll fix it.

• Difficulty ratings are personal. They reflect how hard I found the problem. If I haven’t solved the problem yet, it’s obviously just a guess.

• If the question is “Solved”, that doesn’t necessarily mean I solved it by myself. It just means that I’ve included a solution.

• I post code in some of the solutions. It’s generally terribly written code, but for one-off math problems, I’d rather not spend the time to clean it up.