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Closest I can think of to infinitely replayable games are rougelike games like Slay the Spire, Peglin, Shotgun King: The Final Checkmate, Backpack Hero, etcetera, and sandbox games like minecraft (or Minetest if you don’t feel like spending money and/or don’t already have a minecraft account).
Though, with the rougelike games I mentioned, there are upper limits to increasing difficulty levels.
So far I am lucky enough to have not had any classes that have had the issue of a professor not being able to get their projector or computer to work.
Closest I had was the Linux VMs we were using for a Linux fundamentals class were having troubles because someone gave them too much resources by accident (I think it was memory but I don’t fully remember), causing them to sometimes just stop working because there wasn’t enough for every VM. Somehow persisted pretty much the whole quarter before being figured out.