Extra money:
Search these four secret rooms to find extra money.
Climb the furnace pipes in the kitchen to grab the bucket, then fill it up in the bathroom. Use it on the fire in the dining room, and press B.
Jump into the frame next to the picture of cousin It on the landing near Thing. Then, press Up + B.
Swim into the tunnel past the wrench in the pond.
Press B on top of the cabinet in the attic (near the door to the roof).
Super password:
Enter 6R2KK as a password to have Fester, Wednesday, Gomez, and Granny rescued.