The SKETCH System Core Rulebook (2009)

Publisher's description:

SKETCH games are designed for one-off, single night adventures, for when gaming groups are taking a break between campaigns, or if a few players want to do a fast off-the-cuff adventure with no intention of getting involved in a long campaign. Of course, the rules can be used for long campaigns if you really want, but the simplicity of the rules and character creation is such that a game can be set up in minutes and run in just one night. The rules are simple and easy to use, requiring only the use of one six-sided dice for all aspects of the game.

So, if you find yourself stuck for an evening’s adventure and need something to play at a moment’s notice or you want to playtest a new campaign setting you’ve designed, then a SKETCH game is your answer.