Unlock Everything
At the title screen, press in order [Left], [Right], [Square], [Circle], [X], [Triangle], [R1], [R2], [Down], [Up], [L1], [L2]. If done correctly you'll hear a jingle. You must input this quickly.
Hints
Unlockables
More Levels - Gain C or above grade in previous level.
Nightopian Status - Pause , hold [L1] and [R1], press [Triangle].
Play as Reala in Spring Valley Remake - Set PS2 clock to April 1st.
Twin Seeds Final Level - Gain A grade for all dreams.
Xmas Nights - Complete the game with both characters all As.
Xmas Nights Gallery, Nightopian Viewer and Tracksuits - Complete Xmas Nights with both Characters.