Game shark codes:

Master code "must be on"
0E3C7DF2 1645EBB3
0C1741E3 F8A0DC5F
 
Unlock: 
level 2    1CEA2AE7 F8FCFEF1 
level 3    1CEA2A67 F8FCFEF1 
level 4    1CEA2A27 F8FCFEF1 
level 5    1CEA29E7 F8FCFEF1 
level 6    1CEA29C7 F8FCFEF1 
level 7    1CEA2A07 F8FCFEF1 
level 8    1CEA29A7 F8FCFEF1 
level 9    1CEA28C7 F8FCFEF1 
level 10   1CEA2987 F8FCFEF1 
level 11   1CEA2A47 F8FCFEF1 
level 12   1CEA2527 F8FCFEF1