At the title screen, press Left, Right, X, B, A, Y, RB, RT, Down, Up, LB, and LT in that order. If done correctly, you'll get a confirmation that everything in the game has been unlocked, though save data, achievements, and posting to leaderboards will be disabled until you restart the game from the Xbox Dashboard.
Left, Right, X, B, A, Y, RB, RT, Down, Up, LB, LT - Unlock Everything
the IDEAL (10) Spring Valley cleared.
the POSSIBILITY (20) Mystic Forest cleared.
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If you complete Christmas NiGHTS as both Elliot and Claris, you will unlock the option to view the Nightopian Collection on the main menu. This will show the Nightopians, Mepians, Nightopian/Mepian eggs in each level, as well as the mood of the Nightopians and Mepians in that level (the music alters based on how happy or sad they are).
Nightopian Collection - Complete Christmas NiGHTS as both Elliot and Claris.
At the title screen, press Left, Right, Square, Circle, X, Triangle, R1,...
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DREAMY !!! - Show your supreme skill by achieving the highest Acrobat Time rating, "DREAMY".
Hello Mepian - Make a Nightopian and a Nightmaren have a hybrid offspring.
into dreams... - Clear all stages with a score of Rank A.
Merry Christmas! - Clear Spring Valley (Christmas).
Mystic Garage - Try to guide the lost car in the Mystic Forest to the garage.
Paraloop Master - Try to Paraloop all of Gillwing's tail in one hit.
the AFFECTION - Clear Splash Garden in either BRAND NEW DREAMS or SEGA SATURN DREAMS....
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