Alternate title and loading screens - Set the system date to any day in November to get Hello Kitty birthday themed title and loading screens.
Bonus sailor costumes - Successfully complete a level with an "S" rank to unlock a bonus sailor costume.
Cheerleader costume A - Successfully complete all the cheerleader blocks in the Messy Park level to unlock the Cheerleader costume A.
Cheerleader costume B - Unlock Cheerleader costume A, then defeat all the cheerleaders again in the Messy Park level to unlock Cheerleader costume B.
Play as Badtz-Maru - Successfully complete the game with the good ending and unlock Badtz-Maru's profile. Start a new game to have the option to play as Badtz-Maru.
So Long! Round Earth! cinematic - Intentionally lose against the final countdown Boss to unlock the So Long! Round Earth! cinematic for purchase.
The Taste of Victory cinematic - Defeat the final countdown Boss to unlock The Taste Of Victory cinematic for purchase.