The CHALLENGERS role playing game was written by David Nalle and published by Ragnarok Enterprises in 1985. The game consists of two digest-sized books. The first book contains the rules and combat system, while the second book provides a campaign background and six adventure seeds.
A revised version of the game received minor development efforts ca. early 1998; it was intended to use a standardized mechanics system based on percentile dice. Some components of the system were published on a (restricted access) playtest site.