Free movement mode
Move Casper to the topleft corner of any game location. Then, hold Up/Left + L1 + R1 + Start (this will freeze the game). Release Up/Left + L1, and press Down/Right + Triangle while continuing to hold R1 + Start. If you entered the code correctly, the game will resume in free movement mode. Press R1, then use the D-pad to fly over any wall. Press L1 to resume normal game play.
Instead of using the puzzle pieces to get the morphs to finish the game, use the following trick. Enable the "Free movement" code. Starting from the main hall (with the twisting floor), move up the left staircase. When the next section is done loading, press R1 to go over that wall, then go down until a room appears. It contains all the morphs, items, and food needed to complete the game.
Defeating the ghost bosses
|Infinite Health||8007F01C 0064
|Infinite Fools Gold||8007EA30 FFFF|
|Have Brass Key||8007EA28 0001|
|Have Iron Key||8007EA2C 0001|