The Microlite75 Basic rules are based on three little booklets found in the boxed set of the 1974 original edition (0e) of the world’s most popular tabletop fantasy roleplaying game. The rules are not intended to be a clone of the 0e rules, but rather a conversion of them to a rules-lite D20-based system that encourages old-school play without strictly old-school rules. Microlite75 Basic is based on the third edition of the original Microlite74 rules, modified to use advancement and experience systems closer to those of the original game and including some of more popular systems from Microlite74 Extended (e.g. Body Points and Backgrounds).
Although the Microlite75 Basic rules are complete, they are fairly basic. There are only three classes (Fighters, Magic-Users, and Clerics) — however, backgrounds allow a great deal of easy character customization. Spells are limited and character levels top out at 12 to 14. Microlite75 Standard and Microlite75 Extended provide more classes and other options.