SS13/14 is a monstrous amalgamation of a roleplaying game, it was originally a simulation of atmospherics and thermodynamics of a space station in a RPGmaker style game engine, in which anyone can modify its code. It rapidly escalates from there.

Anything could happen in a round of Space Station 13 and 14.

The station captain minding his own business? Not anymore, 4 nuclear terrorists---smuggled inside a fridge by a clown which somehow breaks in the station's bridge---proceeds to gun him the fuck down, and proceed to run off after stealing his nuclear authorization disk. Also the clown is one of them.

While that happens, a botanist managed to construct a really big hotbox filled with weed fumes, which comes from of course, rainbow marijuana leaves, that is genetically modified to give free seizures.

Oh, talking about illicit drugs, the food is filled with mindbreaker toxins and LSD by the cook, that is bored. Don't eat those.

Anything that happens, will happen, this game is Murphy's Law cranked to 11.

And that is only one of the gamemodes, there is one where you play as a colonial marine fighting against xenomorphs and also predators (from the 1987 movie). That game is like Aliens, except you can play it, and now with extra friendly fire incidents!