Thanks to Nick Johnson, I created an account for Burdick students here:
https://www.explodingdots.org/g/wet-rat-38 . I haven’t had a chance to play around with it too much, but I wanted to get this out to the Burdick community ASAP. It looks like a fascinating way of approaching mathematics. This account is free and is designed for students between the ages of 11 and adult (go ahead, moms and dads, try it out).
Here’s an FAQ about the Global Math Project. https://www.explodingdots.org/g/wet-rat-38/faq .