The original version ("1st Edition") focused on on small, specially trained and equipped "Prime Teams" who were sent on exceptionally dangerous missions. It featured its own unique RPG "engine" which many players found confusing and limited in its character development abilities. The more recent versions of the RPG allow for more flexibility in character creation, as the game's base format has been licensed in three different gaming system versions: Plans for versions based on two other systems have either been abandoned or permanently delayed: