Katamari Forever contains a mix of 34 levels, with some being brand new and some being levels from previous titles in the series. Older levels take place within the mind of the King of All Cosmos, who gets knocked in the head and suffers from amnesia. The levels are black-and-white in appearance, and the objective is to roll up junk to bring color back to the stages. New stages take place in the present, where RoboKing, a robotic version of the King of All Cosmos created by the cousins, goes on a rampage and destroys all the stars in the sky.The objective of the new levels involves creating stars by rolling up junk as in previous Katamari Damacy games. New additions to the gameplay include: the "Prince Hop", which allows the Prince to hop into the air by flicking the controller up or pressing a shoulder button; and the "King Shock", which sucks nearby objects onto the katamari like a magnet.