Risus is far more than an emergency tool: it's a flexible, simple and tactical system which manages to strip the RPG genre from all its dangly bits and leave only the innermost mechanical skeleton. Effectively, all other RPGs work on the same basis as Risus: set a difficulty, roll to succeed. What Risus does best is doing so easily, quiclky and with unparalleled elegance. You can hack this system and modify it as you see fit for all occasions and still have tons of fun.
give it a shot, it's worth it.
[5 of 5 Stars!]