When I last had access to this version of the site, Microlite74 2.0 was the latest version of Microlite74. Since then, A lot of new Microlite74 material has come out. The current edition is 3.0 and there are a number of companions and variant versions available.
Microlite74 is a family of free old school tabletop roleplaying games produced by RetroRoleplaying.com. The goal of Microlite74 games is to recreate the style and feel of that very first (“0e”) fantasy roleplaying game published back in 1974 without giving up all of the clearer mechanics of modern D20-based versions. Microlite74 games are based on the original 1974 edition of the world’s most popular fantasy roleplaying game filtered through the rules light Microlite20 version of the third edition of the rules system. Microlite74 games 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.

There are three major versions of Microlite74: Basic which is similar to the original 3 little booklets in the 0e boxed set, Standard which is similar to the original 3 little booklets in the 0e boxed set plus most of the material from the supplements and “official” material published in the early magazine articles, and Extended which includes everything in Microlite74 Standard does and adds the 0e house rules the author was using in the late 1970s.

Microlite74 Companion volumes add optional rules and optional expansions to the Microlite74 system. There are currently five Companion volumes: Companion I: Optional Rules, Companion II: Treasure, Companion III: More Optional Rules, Companion IV: Bestiary of Monsters, and Companion V: First Edition Spells. These volumes provide many optional rules as well as more complete descriptions of treasure, monsters, and spells. Using Companions IV and V along with the Microlite74 Standard or Extended rules provides a “first edition”-like experience (instead of the original “0e” edition).

Finally, there are special versions of [i]Microlite74[/i] designed to provide a specific “feel” for specific types of campaigns. Currently, two special versions are available. Microlite74 Swords & Sorcery is Microlite74 Extended with many special rules designed for swords & sorcery style campaigns. Microlite74 Special Version I was designed for a specific campaign setting for a Retro-Roleplaying Cancer Fund contributor who graciously allowed us to make the rules available to everyone (stripped of specific information on his campaign world).