From publisher blurb:
Microlite74: Perilous Adventures is a Microlite74 variant originally designed for the author's Wilderlands campaign. This version takes the full rules from Microlite74 Expanded as a base, but trims things back to three character classes (Fighter, Cleric, and Magic-User) from the three original 0e booklets and uses backgrounds and different spell lists (illusion, necromancy, witchcraft, wizardry, clerical and druidry) allow a wide variety of player characters -- without all of the complexity of the additional classes and subclasses added in later versions of 0e. If you like the idea of the original three classes from the white box version of 0e, but would like more complete rules and a few more options for player characters, give this version of Microlite74 a try.
A special edition of Microlite74: Perilous Adventures with donated art was released for RetroRoleplaying Cancer Fund donors in early 2015. The plan was to release a free version (with public domain art) about 12 to 18 months later. As over three years have past, this plan suffered from some large schedule slippage. The rules have been slightly revised for this release and a few additional optional rules have been added.