I did not see that link initially, I think it would be worth a/b testing a version where the option to play without signing up button is visually as dominant as

I did not see that link initially, I think it would be worth a/b testing a version where the option to play without signing up button is visually as dominant as the signup. Visitors that know that they don't know enough will always signup. I knew that I'd like to learn more Foundation, so immediately submitted my email address. But I would suggest that a decent slice of your users don't know what they don't know - ie. that there is a Bootstrap alternative that is just as flexible, powerful, and easy to learn. Getting those people three steps down the path before giving them a hurdle of signup would, in my opinion, result in a larger user count and greater project impact in the long run.