Easter Egg - Comet shower | |
| To use the Comet Shower you must unlock all of the comets by completing levels in the game, by a certain amount of time. After unlocking all of the comets go to the planet viewer and use every comet by pushing a certain button. The Comet Shower should begin. | |
Unlockable - Unlockables | |
| View The Cosmos | Have a planet/star created, then walk into the background in the meadow |
| Save the Earth Mission | Beat the game, then talk to the astronaut. |
| View the Ending Credits | Beat the game, then talk to the schoolgirl in the meadow. |
| Katamari Memorial | Beat the game |
| Special Title Screen Message | Beat the game, then go to the title screen |
| The Rose Level | Completing every other stage in the game, including the cousin-roll-up stage unlocked by talking to the boy after finding all of the cousins. |
| Roll Up The Cousins Level | Roll up all the Cousins hidden throughout the game, then talk to the boy in the meadow. |
Unlockable - Rose Rewards | |
| New start-up text | Collect 1,000,000 Roses |
| Cover Level Select screen with roses | Collect 1,000,000 Roses |
| Altered loading screen | Collect 1,000,000 Roses |
| Extra Dokaka song | Collect 1,000,000 Roses |
Unlockable - Bonus Movies (PAL edition only) | |
| Bonus movie 1 (Katamari Damacy intro movie) | Complete the "roll up the sun" level. |
| Bonus movie 2 (Hoshino family cut scenes) | Complete the "roll up the cousins" level. |
Secret - View Katamari Damacy Constellations | |
| If you've played the original Katamari Damacy, chances are you can view the constellations (Cygnus, Ursa Major, etc.) that you've previously made. If you have your Katamari Damacy data saved on the same Memory Card as your We Love Katamari data, an option will come up on the data screen for you to upload the constellations from the previous game. | |
Secret - Million Roses Respawn | |
| While trying to accumulate 1,000,000 roses, pause and select "retry" to instantly respawn the stage's roses without losing the ones you have collected so far. | |
