Scooby-Doo! Night of 100 Frights Cheats (PlayStation 2)

To unlock all power-ups, pause the game and hold all four shoulder buttons, then press:
Circle, Square, Circle, Square, Circle, Square, Square, Square, Circle, Circle, Square,
Circle, Circle, Circle.

To see holiday Easter Eggs, set your clock to one of the dates listed below:

  January 1st: Fireworks appear in the courtyard.
  February 14th: Hearts appear on Snack pickups.
  March 17th: The fountain is green and chimneys emit green smoke.
  July 4th: Fountain and chimneys on house are colored red, white & blue. Fireworks in
the courtyard are also red, white & blue. 
  October 31st: Bats can be found hanging in the courtyard.
  December 25th: Snow appears in the courtyard.
  December 31st: Fireworks appear in the courtyard.

To unlock the Credits, pause the game and hold all four shoulder buttons, then press
(quickly): Square, Circle, Circle, Square, Circle, Square.

To unlock the movies, pause the game and hold all four shoulder buttons. Then press:
Square, Square, Square, Circle, Circle, Circle, Square, Circle, Square.