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You guys would probably love a survival game called Rust. You wake up on a beach, naked, with only 2 items: a torch for when it gets dark, and a rock for gathering resources (to make tools, etc.)
From there, the multiplayer world is your own to make of it what you will. You must make a shelter to avoid being robbed/killed by other players, and you must then advance towards firearms to fend off bears/wolves. I love to play it before I go /out/ because it really gets me in the mood.
By the end of the month (it resets every month) you can have cars to drive around in, helicopters even, but you must achieve it through your own natural instincts.