Searchers of the Unknown is a one-page roleplaying game where player characters are entirely defined by a minimalist old school Dungeons & Dragons one line tat block (e.g. "AC 7, MV 9, HD 2, hp 9, #AT 1, D 1d8 mace") something like monster stat blocks in TSR editions of D&D. All actions are based on those stats. Armor class is the old school "lower is better," but the way armor class is used in SotU it makes sense with armor class generally helping against attacks but hindering initiative and attempts to be stealthy. The basic SotU generally uses a level plus AC roll under mechanic, using an opponent's AC when attacking or the character's own AC when trying to be stealthy. Saves require a roll under level plus 4. Variants versions of SotU use D20 or Target20 rolls. In the basic game, all characters are human adventurers. Supplements add demihumans and spell-casting classes.
(Like Microlite20, the original Searchers of the Unknown rules inspired a large number of similar games based on the same principles, ranging from simple variants like SotU Refired to modern day games, science fiction games, after the holocaust games, etc. Most of these games are complete in one or two pages. A few have additional supplements of their own. Most of these SOTU supplements and variants are available in this download library.)