All Working Scooby Doo: Night of 100 Frights Cheats - Xbox

All power-ups
Pause game play then hold [L] + [R] and quickly press [B], [X], [B], [X], [B], [X]x3, [B]x2, [X], [B]x3.

All warp gates
Pause game play then hold [L] + [R] and quickly press [X]x2, [B], [X]x2, [B], [X], [B]x3.

View credits
Pause game play then hold [L] + [R] and quickly press [X], [B]x2, [X], [B], [X].

Defeating the Black Knight
Ram red switches when Black Knight moves near them.

Defeating the Funland Robot
Ram him, then super slam 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.

from Shaggy
If you die after getting all the keys and having Shaggy up in the coffins, when you restart the level you can talk to an invisible Shaggy and still have him help you jump and walk around in his arms. You can take him all the way through the level to the doorway.