Really, I’m not kidding. (You can view the PDF for free, but if you decide to play the game, please do kick in the $2 that Ad Astra is asking.)

It isn’t comprehensive, and it’s not at all suited to people who haven’t made their bones with more complex games (unless perhaps it’s the one noob in an experienced group), but it is clever, quick, and - from what I can tell - perfectly suited to a casual RPG session. The basics are covered, and the game is brilliantly self-balancing.

And it fits on one sheet of paper (front and back).

Kudos to the designer(s); they’ve successfully painted a frescoe on a toenail.

(H/T Shlock Mercenary)