This started as a demonstration of how to make scrolling walls. The walls are constructed randomly. I just (4/4/15 at about 6:30 PM Eastern) turned it into a "game." A pretty simple game -- use the arrow keys to move the ball back and forth, avoiding the walls. When you hit a wall, the game is over. Your score is at the top, and is based on the timer from the time you hit the green flag.
Discussion forum thread --> https://scratch.mit.edu/discuss/topic/104192/ I MIGHT have to make the ball smaller, not sure yet. Leave me feedback!! Name inspired by Dr. Seuss ;-)