It is used in All Flesh Must Be Eaten,[1] the Buffyverse role-playing games, CJ Carella's WitchCraft, Conspiracy X (2nd Ed.

Gamemasters (called "Chroniclers" in Classic, and "Directors" in Cinematic Unisystem) are also given tables of successes: characters that get a higher roll than the required nine have bonuses on their final outcome; this table describes how successful they turn out to be, and gives guidelines to figure out the resulting bonuses.

Classic Unisystem was developed first and is featured in All Flesh Must Be Eaten, Armageddon, Conspiracy X 2.0, Terra Primate[6][10] and WitchCraft.

First developed for the Buffy the Vampire Slayer Roleplaying Game,[11][12] it was later adopted for use in Angel,[13] Army of Darkness[9] and Ghosts of Albion.

Cinematic features a limited set of skills that cover most situations, no Secondary Attributes or Essence, simplified combat and flat damage resolution.