"There is always a lighthouse, there's always a man, there's always a city." According to BioShock Infinite, these are the constants in an infinite universe of variables. In every world the cycle will repeat in one form or another, and there will be a lighthouse to guide people, a city to contain people, and a man to oppress people.
But more games than just BioShock and BioShock Infinite explore these tropes. If those are, indeed, the things that make a BioShock game, there are plenty of other games that might as well be BioShock games. So let's head into the lighthouse and explore these would-be BioShock Prequels.
Note: BioShock Infinite spoilers follow--you've been warned.