Flash platformer Canabalt may be simple in concept, but what it lacks in gameplay variety, it more than makes up for in being awesome. This "daring escape" platformer is simply beautiful and beautifully simple.
Two things to note. One, my best performance is some 3500 meters. Likely easily crushed with the right randomly generated set of rooftops on which to jump across. Two, it took me a shamefully long time to see what it was I was probably running from. Don't be like me. Be better. Play Canabalt. And turn the volume up.