After pausing the game, hold L1 + L2 + R1 + R2 and press Square(3), Circle(3), Square, Circle, Square.
All Power-Ups
After pausing the game, hold L1 + L2 + R1 + R2 and press Circle, Square, Circle, Square, Circle, Square, Square(2), Circle(2), Square, Circle(3).
Beat Red Beards Ghost
Avoid the white ghosts, then bounce on the ghosts with the rainhats on. Stand next to a corner rope after you defeat the ghost, because Red Beard will throw his sword and cut the rope. Do this in all 4 corners and the treasure chest over his head will kill him.
Defeating Master Mind
He will send out robots and space kooks. Defeat them and when the electric field is down, ram the red switches, Keep repeating this until he falls off his platform. Then, dodge his robots and supersmash them. When the electric field is down again, ram the two red switches and repeat two more times.
Defeating The Green Ghost
Daphne will open coffins. When the Green Ghost hovers over an open coffin, Super Slam the switch.
Get To Creepy Crawlies In The Hallways
First go to smugglers cove then go to shock on the dock part II. There is a pile of planks near the warp gate. Do a thunder smash on it and then you will get to creepy crawlies in the hallways.
Holiday Bonuses
Change the PlayStation 2 system date to one of the following entries to see special things at the front yard and the mystic playground:
January 1: Different fireworks.
July 4: Fireworks and other things.
October 31: Giant bats over door for decoration.
December 25: Snow.
Location Of The Helmet
You can find the helmet on the top of the mountain in the level Chills and Thrills on Haunted Hill part 3.
Location Of The Springs
It's located on pier on the pier part 2.
Location Of The Umbrella
Go to "Gloom & Doom Down in the Tomb" part three and beat the green ghost and you'll save Daphne, meet Polly, and get the umbrella.
Power-ups
Double-Jump Spring: Press X(2) while jumping.
Football Helmet: Hold Square.
Bunny Slippers and Lampshade: Press R2.
Walk with Bunny Slippers: Hold R2 and walk in any direction.
The Hedge & The Helmet
When riding with Shaggy through the thorny ground, you can sit beside Shaggy and duck under some of the obstacles. This works especially well with the Gargoyles that breathe fire. When you get through the hedge, you have to climb the mountain- and that's where the Helmet is. Watch out for the shaky platforms, falling boulders and the Scarecrows.
View Credits
After pausing the game, hold L1 + L2 + R1 + R2 and press Square, Circle(2), Square, Circle, Square.
Warp to Gloom Doom Down in the Tomb
When playing the game, go to 'The One Way Trip To the Crypt' level with the warp gate on it. Activate it and go to the warp gate North-West from the one you are on and press X. Even though you haven't even gone into this level, you can get Scooby snacks and beat the Green Ghost. To make sure that the cheat has worked, go down the path where the buttons are and go through the gate. You see the locked gate, but when you go near it, it opens.