 Pulver contributed adventures to several anthologies published for "GURPS", and also designed "GURPS Psionics" (1991) followed by "GURPS Vehicles" (1993).The latter featured a mathematically complex vehicle-construction system, allowing the creation of vehicles ranging from a stone-age canoe to faster-than-light starship.This system was later simplified for "GURPS Traveller" (especially "GURPS Traveller