 He contributed to "GURPS Traveller" and "GURPS World War 2" lines, and created "Transhuman Space" (2002), a new science fiction setting and game line for "GURPS".Pulver assisted Sean Punch with the fourth edition of "GURPS" beginning in September 2002, and with releases from 2004 to 2009.His vehicle design rules for the 4th edition of "GURPS" were released in "GURPS Spaceships" (2007).