Katamari Damacy

Eternal 1 level:
Build the ball up over 1m, 30cm, 3mm in the Make A Star 4 level.
mau, c lptlhbr, Ernie Tran and Jason Voorhees.

Eternal 2 level:
Build the ball up over 25m in the Make A Star 8 level.
Ernie Tran and Jason Voorhees.

Eternal 3 level:
Build the ball up over 800m in the Make The Moon level.
Ernie Tran an Jason Voorhees.

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.
Ernie Tran and Jason Voorhees.

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.

Control credits:
After completing the game and the credits begin, you can control the Katamari in the background to roll up items.

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.
Jibber Jabber.

Hidden cousin:
Once all levels have been completed, replay the past levels. Somewhere on each map you will be able to pick up a cousin to add to your collection. Note: This was found to be true on Make a Star 4 and Make a Moon at least.
Jibber Jabber.

Self-movement:
When on your home world, allow the controller to remain idle. Your character will begin to move on their own.
Jibber Jabber.

Hint: Tekken reference:
In the Make A Star 4 level, go to the entrance to the garden and look at the side of the teddy bear. It reads "Kuma's Bear", refering to Kuma from the Tekken series.
Robby Gaskins.