Canabalt

You begin Canabalt running down a corridor as the world rumble ominously around. You either jump over or crash into a couple of pieces of office furniture and then throw yourself through the window and onto the next rooftop.

You can't stop running in this classy side-scrolling freerunner game. You just have to time the jumps to avoid the gaps, and the odd robotic monster and collapsing building. You build up pace the more you avoid obstacles, and you can use the obstacles to check your pace if needs be.

Press 'x' or 'c' to jump... that's it.

Pressing for shortened periods of time will garner different strengths of jump. This is absolutely the crux!