If you want to check out some classics look up project 1999 for EverQuest or the classic world of warcraft servers. RuneScape isn’t a bad choice if you’re into the grind.

Modern I don’t think there’s much I can recommend, even the subscription based games have stores attached now & few or no in game events run by GMs

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Bellman’s lost in a forest problem: https://en.wikipedia.org/wiki/Bellman’s_lost-in-a-forest_problem

Generalized moonshine: https://en.wikipedia.org/wiki/Monstrous_moonshine#Generalized_moonshine if the moonshine phenomena also exists outside the monster group

Snake in a box problem: https://en.wikipedia.org/wiki/Snake-in-the-box

Cursed unsolved math problems sounding like the beginning of a horror story:

You’re lost in a forest without a map and compass…

Does generalized moonshine exist?

What’s the longest snake you can jam into an n-dimensional hypercube?

Just a heads up the not AI check here link gives me a 401