[@GarlandDaHero] I had considered the "video game" element of it, since video games handle the movement of players easily through joining, quitting, and respawning. Making it a video game would allow for a lot more freedom in regard to the environment and set pieces, but then I need an explanation for people appearing there in the first place. 

Kidnapping: Hard to explain how they got here, easy to explain why, and easy universal end goal (escape).
Voluntary: Everyone makes up their own reason for how and why, but then there would be character development IC to reflect on it, and it'd be hard to explain why they left. And there's no real universal end goal, except maybe a fat sack of cash.

EDIT: Also I will need halp pls making up rooms, if rooms are used.