Scooby Doo: Night of 100 Frights Cheats

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. 

Just set your PS2 system clock to January 1(New years), July 4(US Independence Day, October 31(Halloween), or December 25(X-Mas) and the mystic Lawns ecor will alter to reflect that holiday

If you set the date to February 2nd,when you eat a Scooby Snack, it will have a small flower above it after you ate it.

Beginners, when you get to the place where there are 4 floors, the bottom one topples, so if you don't want the caveman to get out of the ice, simply go through the floorboard PAST the ice block and let it slide you down. this skips the fact that you will get pummeled by the caveman's club. pretty clever, huh? Also, some big enemies are able for you to head butt them (run at them) this will make them dizzy for a while but can get back to normal. But the zombies in the hedge maze, unable to head butt. sorry :(