"BRP" was conceived of as a generic system for playing any sort of RPG. Specific rule systems to support differing genres can be added to the core rules in a modular design. In order to underscore this, in 1982 Chaosium released the "Worlds of Wonder" box set, which contained a revised main booklet and several booklets providing the additional rules for playing in specific genres. "Superworld", a superhero-themed game, began as a portion of the "Worlds of Wonder" set. In 2002, a third edition of the core booklet, now titled "Basic Roleplaying: The Chaosium System", was released in 2002.