Maze Rats is an elegant and minimalistic OSR that aims to create fast and very narrative characters and adventures. Mechanics are simple enough to don't bog down play and tables make for very colorful characters and situations.
One interesting point is that characters are mainly defined by the equipement they get, being a classless game. For example, one of my players received a shovel, lamp, big sac and other stuff, so decided to be a tomb robber. The other one received three shackles, so slaver. If you have imaginative players, this game is pure gold.
More people should value (and play!) Maze Rats as a game on its own, and not just because of the amazing random tables it brings.