The Microlite20 RPG Collection is the basic Microlite20 game with a huge collection of supplemental rules and variants as well as a large number of games based on the original Microlite20 system. While the original system was designed for fantasy games as are many of the games based on Microlite20 included in this free collection, this collection also includes Microlite20-based science fiction, horror, superhero, cyperpunk, espionage, etc. games. Also included are Microlite20-based versions of popular games from the 1970s and 1980s and Microlite20 versions of 4e and 5e. Finally, there are "large" versions of Microlite20 that include more of the 3.x SRD to make more complete games that while still much smaller that the original are complete enough that one does not have to refer to the SRD to play.