Get a "C" or better rank in a level to unlock a bonus level.
Get an "A" rank for all Dreams to unlock the Twin Seeds Final level.
Set the system date to April 1st to play as Reala in Spring Valley Remake.
Successfully complete the game with all "A" ranks with both characters to unlock Xmas Nights.
Successfully complete Xmas Nights with both characters to unlock the Xmas Nights Gallery, Nightopian Viewer, and Tracksuits.
Pause the game, then hold L1 + R1 and press Triangle.