The trick to level 20 is this: When the level is about to start, you move over to the right wall. From there, the level starts and you have to jump the gap onto the spiral, preferably the three block jump (third platform from the left, I don't know how else to describe it). You then INSTANTLY have to hold down the right button through the rest of the level. If done right, you will be able to make it to the last square before the finishing gap, and be able to jump it. If this jump is missed or the level is otherwise lost, you have to start the level over by going to PAUSE then SELECT LEVEL. Just runnning off the edge WILL NOT WORK, there is not enough time to get to the side wall and make the jump from the failed level restart. (If this tip is helpfull, post it again when needed, but please not in a way that could be considered spam.)