MOSP is the name of the puzzle hunt run at the Math Olympiad Program. It was started by Evan Chen in 2021 because he had slightly too much time on his hands, as well as the assistance of Serena An, Sanjana Das, and Isabella Quan. After that, it was decided to make this a continuously running hunt which chronicled the adventures of the alternate-universe MOSP, with new chapters being released at MOP each year.
The hunt is designed with longevity in mind: anyone should be in principle about to start with chapter 0 and enjoy nearly all of the entire experience.
If you’re new to puzzle hunts, check out this page. Otherwise, feel free to jump on in!