Microlite74's rules were written to support the "old school" style, while retaining many of the more modern rules features of OGL games based on the 3.5 SRD. Release 1.1 contains minor error corrections, information on other OGL retrogames based on early editions of the world's most popular fantasy roleplaying game, and new rules for morale, hirelings, and equipment. Microlite20 trimmed the fat from the 3.5 SRD, paring the game down to a fast-moving and easy to learn two-page system. Microlite74 takes the M20 system and modifies it for a 1974 style, but leaves most of the basic Microlite20 rules in place.