From the Game's Introduction: Microlite20 is a trimmed-down, subminiature version of the Primary Fantasy SRD rules (see license for more info) that has been designed to be quick and easy to play. The goal was to create a simpler game, but one where all of the resources of Primary Fantasy SRD (monsters, spells, adventures and equipment) could be used without conversion. Microlite11 replaces Microlite20's standard Race + Class system with a Point-Buy system for creating customized characters or new Races and Classes.