That's a fantastic and completely fair point. My initial thinking for requiring a sign-up was to allow users to save their progress as they solve more problems, but you're 100% right that it creates unnecessary friction and prevents people from seeing the core product.

Being able to try an example problem instantly is a much better experience. Based on your comment, this is now my #1 priority to fix. I'm going to work on adding a live, interactive example directly on the homepage.

This is incredibly valuable feedback – thank you again for taking the time. It's exactly why I wanted to share the project here.