Code notes:

Enter the map editor, hold Up, hold A, and hold B. With all these 
pressed, press P. Then, enter one of the following codes, then 
press P to resume the game. 

Show FMV sequences:

Enter the map editor. Hold Up + A + B, and press P. Then, press 
Right, A, Left(2), A, Up, B. Press P to view the game's FMV 
sequences. Press any button to advance to the next video. 

Speed up:

Enter the map editor. Hold Up + A + B, and press P. Then, press B, 
Right, A, B. Press P to resume game play with Chauncey moving at 
double speed. Collect the Boots Of Boogie to move at quadruple speed. 

Full map:

Enter the map editor. Hold Up + A + B, and press P. Then, press Left, 
A, Up, Down, B, A(2), B. Press P to resume game play with the ability 
to immediately view the entire map. 

Level skip:

Enter the map editor. Hold Up + A + B, and press P. Then, press Down, 
A, Left(2), Down, A(2), Right. Press P to resume game play to 
complete the current level and return to castle. 

More money:

Enter the map editor. Hold Up + A + B, and press P. Then, press Left, 
A(2), B, Left, A, Right, Down. Press P to resume game play and give 
Chauncey the maximum (30,000) number of crowns. 

All items:

Enter the map editor. Hold Up + A + B, and press P. Then, press B, 
Right, A, Left(2), Down, Right, A, Left(2). Press P to resume game 
play with all items available for the inventory. 

Continues:

Enter the map editor. Hold Up + A + B, and press P. Then, press A, 
Down(2), Right, A, Down. Press P to resume game play. The game will 
continue even if the entire village is destroyed. 

Invincibility:

Enter the map editor. Hold Up + A + B, and press P. Then, press B, 
Up, Right, Down, A, Down, A, Right. Press P to resume game play with 
an invincible Chauncey.