Thanks for mentioning this, we've tested the site back to IE10, but the JS support before that is so spotty that we could literally spend several months working to fix it and made the choice early on that it wouldn't be worth it, schools or no. With the time that it would take to support earlier versions of IE, we could produce an entirely new beginner campaign, which we're thinking we'll do in the near future.

Sorry about that, irony indeed! We were working a bit too hard the other evening get it pushed and I fear our cross-browser testing was a bit shoddy. We have a github ticket for that and should get it pushed to the live site very soon. Thanks for the screenshots!