The tiny A7 character sheets will be enough for any one-shot. But! Take a look at the A4 character sheets. Fill it out and you will have a character more complex and interesting than any boring optimised D&D paladin. Well made.

It is elegant, well thought-out and fun... for "low-level" play, at least. The characters can quickly become almost demigods, stronger monsters require you to roll tens of dice (and then sum them all up). The section about monsters overall is pretty lacking, in my honest opinion. It tells you how the monsters work but the "bestiary" is only a few monsters, which completely does not give me the vaguest idea of what is going to be too easy, what is going to be overpowered.

That said, the way of describing monsters (their strength, HP and EXP is just one number) is genious. The three classes are well thought-out, the kindreds all follow the same multiplier mechanic, which makes creating a character a walk in the park. It only uses d6s.

Fast, simple and fun. These four pages contain a surprisingly deep system. In some expensive, high-quality RPGs there are different systems for hand-to-hand combat, car chases and rap battles but in Risus - it's one mechanic. The presented rules for character advancement would not work for longer campaigns - characters would become too powerful too quickly. If you intend to run a campaign in this... well, I will certainly try. But it WILL require some extra tinkering.