In the early 20th Century, bored Surrealists created a parlor game where one would draw part of a figure, fold paper so only a bit is shown, then pass it to the next person to continue. In this way a weird, multipart monster would be created in a game now called Exquisite Corpse.
Now a collective of indie devs working (mostly) in the lo-fi PSX aesthetic have created a chain of free games based on a collective story—with a twist. Each game in C.H.A.I.N.G.E.D. (Chainged) ends with a choice, and that choice feeds into a separate game, creating a branching series of games with their own endings. I'm sure you can see where I'm going with this: In true exquisite corpse fashion, developers only knew about games before them in their own branch.