# Completion bonuses

Successfully complete all levels except for the Eternal levels. Then, press Circle at the Earth screen for a sound test and FMV sequence viewer. Note: Press Triangle in the Japanese version of the game.
# Eternal 1 level

Build the ball up over 1m, 30cm, 3mm in the Make A Star 4 level to unlock the Eternal 1 level.
# Eternal 2 level

Build the ball up over 25m in the Make A Star 8 level to unlock the Eternal 2 level.
# Eternal 3 level

Build the ball up over 800m in the Make The Moon level to unlock the Eternal 3 level.
# Hidden FMV sequence

After completing the Make A Moon level, replay it and create a larger Katamari. Replace your old Moon with this to view a new FMV sequence.
# Hidden cousins

Once all levels have been completed, replay the past levels. Somewhere on some if not all maps you will be able to pick up a cousin to add to your collection. Note: This was found to be true on the Make A Star 4 and Make A Moon levels.
# Control credits

After completing the game and the credits begin, you can control the Katamari in the background to roll up items.
# Happy New Year message

Set the system date to just before midnight on December 31. When midnight passes, a message from the King of All Cosmos will appear.
# Self-movement

While on your home world, allow the controller to remain idle. Your character will begin to move on their own.