This is the core rules for Risus, available as a 6-page PDF.
Risus is a complete Role Playing Game (RPG) designed to provide an "RPG Lite" for those nights when the brain is too tired for exacting detail. Risus is especially valuable to GMs assembling a quick convention game, or any late-night beer-and-pretzels outing. While it is essentially a Universal Comedy System, it works just as well for serious play (if you insist!). Best of all, a Risus character takes about 20 seconds to create! -- opening paragraph