I made a thread earlier about Rulebooks, and we pretty much came to the conclusion that it would be too complex to warrant it, even if we already knew all the rules, since there would be too much to keep track of.
Risus is more like a rule
pamphlet, the free downloadable PDF consists of only 4 pages, 6 if you include the "advanced rules" but they are not necessary. The game was pretty much made for people like us and has been around for a decade.
Website:
http://www222.pair.com/sjohn/risus.htmResource Website:
http://risusiverse.wetpaint.com/Direct Download:
http://www.misersoft.com/cumberland/risus-1p53.zip