Scooby-Doo: Night of 100 Frights

After pausing the game, hold L1 + L2 + R1 + R2 and press Square(3), Circle(3), Square, Circle, Square.

After pausing the game, hold L1 + L2 + R1 + R2 and press Circle, Square, Circle, Square, Circle, Square, Square(2), Circle(2), Square, Circle(3).

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.

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.

Daphne will open coffins. When the Green Ghost hovers over an open coffin, Super Slam the switch.

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.

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.

You can find the helmet on the top of the mountain in the level Chills and Thrills on Haunted Hill part 3.

It's located on pier on the pier part 2.

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.