Principia Adventure! #2: A cool friend

Principia fell into a hole last time, but now he has an ally with him. He will help him through the thick and thin. But there's one problem, why don't the rest of the checkpoints work?
Want to be rescued? Comment if so. (If you want to go all the way, email me how Principia rescues so no one knows). Make sure you tell me your username in the email!