We are always looking for new problems to add to this website. If you have an idea for a problem, please fill out the form below. Required fields have a red asterisk next to them. Thanks!

We are always looking for new problems to add to this website. If you have an idea for a problem, please fill out the form below. Required fields have a red asterisk next to them. Thanks!

Hi

On your “about page” you describe the problems as a “closed end” meaning that they all end with the same answer.

But many problems have more than one answer.

Why are you describing them as Closed end

Hi Anne. You’re right. There are definitely problems that have open ends as well. We’ve been a little loose there. For now, let’s focus on ensuring that all problems avoid closed middles.