GURPS Banestorm and GURPS Infinite Worlds are setting sourcebooks and supplements for what edition of the GURPS Role-Playing Game?
GURPS Infinite Worlds: GURPS Infinite Worlds is a supplement for the Fourth Edition of the "GURPS" role-playing game, published by Steve Jackson Games in 2005 and written by Kenneth Hite, Steve Jackson, and John M. Ford.
i don't know