Secret Room
Move in front of the bookcase inside Casper's house. Shoot the bookcase with 
normal, fire, fire, ice, normal, fire, and super spirit blasts (in order). 
The will open to a secret room containing Lucky the Chicken.
 

 Game Shark Codez:
 
               
 Master Code (Must Be On) 
 ECB52F58 14345B9C
               
 Infinite Shield Energy   
 4CC88EE8 1456E7A8
               
 Infinite Comet Energy    
 4CC88EE0 1456E751