Game shark codes:

Master code "must be on"                           
463DC4CB075C3B93                                         
EB181FB953A11A89

Infinite health                          
21DE6BFC9BE93E4E 

Infinite lives
5B8766A82FFDD41C

Always have ring power
5BA78165600A8D4E 

Max gems
C3B7F2F387F9A37F