One Page Universal System Role Playing Game, rules are a single page long. The idea was to create an rpg system that would allow the rules to be printed on the back of each player's character sheet, while still keeping it fast, fun, and pretty universal.
Designer: Unknown
Link to Rules[]
http://web.archive.org/web/20110306050018/http://grapeape.webs.com/
Or
http://games.groups.yahoo.com/group/OPUS_The_One_Page_Universal_System/