NiGHTS Into Dreams - Platform: Playstation 2

Bonus levels:
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Get a "C" or better rank in a level to unlock a bonus level.

Twin Seeds Final level:
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Get an "A" rank for all Dreams to unlock the Twin Seeds Final level.

Play as Reala in Spring Valley Remake:
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Set the system date to April 1st to play as Reala in Spring Valley Remake.

Xmas Nights:
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Successfully complete the game with all "A" ranks with both characters to unlock 
Xmas Nights.

Xmas Nights Gallery, Nightopian Viewer, and Tracksuits:
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Successfully complete Xmas Nights with both characters to unlock the Xmas Nights 
Gallery, Nightopian Viewer, and Tracksuits.

Nightopian status:
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Pause the game, then hold L1 + R1 and press Triangle.