Several years ago I ran a one-shot adventure over 12 hours with like six friends. It was themed around our shared Dwarf Fortress world. It featured twelve artifacts to be uncovered and a lot of super-deadly traps (some homemade, some from books like Grimtooth's Traps). The traps were basically save or die, lots of binary tests, but they were solvable. Like there were clear and obvious solutions possibly seen when you failed or possibly by getting some of the other items or similar. And every night at midnight the moon fell from the sky (ala majora's mask) and wiped out everyone. So there were time constraints, but players would gradually "solve" the game. You didn't need to be particularly personally powerful either, you just needed to know more. Solve the puzzle, save the world, stop the groundhog's day paradox. It worked pretty well.
That said I have not been 100% on whether or not this game would have that, but it was in my back pocket. Some people actively dislike the idea. No guarantee it will happen again, but it seemed like an interesting card to play based on what had come up so-far. Kinda metroidvania inspired.
