Game shark codes:

Unlock Everything!!!  
d01ffe180002 
500008020000 
801F75e00000 
d01ffe180002 
801F75f00000

Unlimited Health (P1)  
800ade94b400 
800ade96b400  

Unlimited Health (P2)  
800ae4e8b400 
800ae4eab400  

Unlimited Time Arcade  
800aa9580063  

One Hit Kills (P1)  
d00ade94b400 
800ade940001 
d00ade96b400 
800ade960001  

One Hit Kills (P2)  
d00ae4e8b400 
800ae4e80001 
d00ae4eab400 
800ae4ea0001