After the success of Katamari Damacy, the King of all Cosmos and his son, the Prince, have gained quite a bit of fame. To keep all of the fans happy, the Prince is once again sent to Earth to roll stuff up with a katamari (a clump of stuff); this time he's taking requests from the fans as to what should be rolled up! The gameplay is the same as in Katamari Damacy; using both of the analog sticks you can push the katamari around. When the katamari runs over an object that is small enough, it will stick causing the katamari to grow in size. As the katamari grows, you'll be able to roll up increasingly larger objects.
There are a variety of different objectives that need to be completed; some tasks will have you rolling up as much as you can within a time limit, others may have you rolling up a fixed number of objects as fast as can, and so on. As the katamari rolls around, it can pick up almost anything; umbrellas, desks, erasers, pencils, batteries, plants, beach balls, tea kettles, fences, assorted animals, people, buildings, trees, mountains, cars, and many other objects.
Between levels there are short cut scenes providing some back story on the Prince and the King of all Cosmos. The game features all new songs as well as a new two player mode.