Yoomp!

Yoomp! is the winner of the 2007 ABBUC software competition. Like a combination of Trailblazer and an often-seen demoscene effect, you fall down a tube, landing on each square progressively in a rhythmic manner. Landing on certain tiles will have certain effects, such as making the screen quake, decreasing the brightness or forcing you to jump. Navigating the tube itself is a matter of planning ahead and compensating for your limited movement capabilities. This game is freeware and can be downloaded on the Yoomp website.