Buffyverse role-playing games
Both games use a streamlined ( or "Cinematic" ) version of Eden Studios' popular "Unisystem" game engine , also featured in "CJ Carella's WitchCraft" and "All Flesh Must Be Eaten" , two of Eden's better-known original product lines . 
<triplet> CJ Carella's WitchCraft <subj> Unisystem <obj> game mechanics <triplet> All Flesh Must Be Eaten <subj> Unisystem <obj> game mechanics