https://experientialrobotics.org/mountainmayhem/ is not working. I have a summer camp next week with materials prepared to use this site and associated links. I see that there are some pages that redirect now to experiential.bot, but as I am going through many of them are missing.
As an interim solution, try the links here: https://www.chiefdelphi.com/t/open-source-xrp-game-for-stem-summer-camps-mountain-mayhem/464987
For those that are doing Mt. Mayhem this summer. The link has been restored.
https://experientialrobotics.org/mountainmayhem/