This game is simple:
You are a member of Vault-Tec who has been tasked with creating a new Vault with a unique social experiment. What is your population, your manipulation, and your predictions?
So come! Indulge your slightly sadistic social scientist self and create a Vault!
Fun!
My Vault goes like this. Only families of 4+ are allowed access. Its overcrowded, like extremely. The place is really nice, but you can't enjoy it because there's like twice as many people as there should be. You can move to a nicer place, but you can only choose one family member to go with you, but only if you request it first, while the other 2+ have to move to an entirely different section, with strict, dormitory/barracks style sleeping arrangements, and are even more crowded. However, the food is great and there is tons of free time for entertainment. What constitutes a crime varies day by day. The only way you can see the family members you don't pick is by sending the one you did to the barracks. Moving in and moving out are punishable by jail time and beatings for the one who moved one in/out. The purpose of this Vault is to see how far a parent/guardian will go to protect/help their children. They will be let out of the Vault after 100 years, and it will be seen if they continue this lifestyle, or totally abandon it.
Are you a writer by chance? Because I would like to see this come to life. Maybe tell the story from the perspective of a Lone Wanderer entering an exploring the vault, or maybe telling it from the perspective of the Overseer. I think it's fertile ground for a nice short story. Or, tell it from an overhead view (I don't know writing lingo), so that you capture the stories of multiple families.
"You've got to remember, though: The Vaults were never meant to save anyone."
For Live Roleplaying: Fallout I wrote up the story of Vault 72, located in the heart of The Motor City, what's left of Detroit after the bombs fell. Without spoiling too much, the social experiment involved low-grade genetic manipulation with a sociological bent (not for medical reasons) and it resulted in what is now the largest group of slavers and cannibals in the Michigan Wastes.
I'm surprised that nobody has mentioned what seems to me to be the obvious answer
Namely, that you'd make a Vault that would be filled with members of this site!
Todd would, of course, be Overseer. You'd have Tae-Rai conducting experiments on lizards in a Science Lab. Mason would be surfing for scantily clad women, and Curse Never Dying working on character builds.
And there'd be a special cellar area filled with all the banned members from the past few years
Why dream up a 'fantasy' Vault - we already have the Tamriel Vault as the ultimate social experiment