Bouncy, Bouncy is a secret level found when the third gnome is collected. You have to collect the gnome.
This secret level has many rooms, like a Training area. The first room has a button, and windows for Meat Puppets to shoot through. The second room is larger, with Meat Puppets in it. There is a third room, which has large balls flying around it, and a gnome in the middle.
You have to get the gnome to win. You must push the button to get to the second room. Then, you have to climb up a ladder, and push another button. Go back down, and go through the door. Grab the gnome to win.