Discworld

A mix of satire and absurd comedy, the Discworld is literally that: a round, flat disc carried by four enormous elephants, themselves in turn riding on the back of a turtle. Chronicled in the novels of Terry Pratchett, the Discworld began as a satire of the fantasy genre and since metamorphosed into a fantasy-flavored funhouse mirror of the modern world.

This is the setting of the Discworld Roleplaying Game, published by Steve Jackson Games. It is a stand-alone RPG that is compatible with the GURPS Fourth Edition rules. There is also an earlier, out-of-print version of the game which is compatible with GURPS Third Edition.