One version is common, at least one other version is rare
 Game design by Simon Knight and Eric Matthews. Main coding by Steve Cargill; additional code by Mike Montgomery and Nick Pelling. Graphic design by Dan Malone; additional gfx by Herman Serrano. Music & sound FX by Richard Joseph; titlescreen music by Farook & Haroon Joi.
 According to coders Dan Malone and Mike Montgomery, the CHAOS ENGINE graphics were created for 32 colours and then reduced to 16 colours for the Atari ST version [Source: Personal communication from the coders, October 2012].