Bonus Levels:
Bea the game in arcade mode to unlock more levels in score attack mode.

GameShark Codes

[M] Must Be First
9C5D88F8
  
[M] Must Be Last
245EECA9
   
P4 Infinite Bombs
2E1DD6B800000003
  
Max Score Multiplier
FD9488010000FFFF
78B300B00000FFFF
   
Unlock All Ships
F794886F000003E0
 
P1 Infinite Bombs
86CC4B7000000003
   
P2 Infinite Bombs
9B883B8E00000003
  
P3 Infinite Bombs
EC6859C200000003
  
P4 Infinite Lives
386E9E5800000003
   
P3 Infinite Lives
FBF4880000000003
 
P2 Infinite Lives
A5CDD0E200000003
 
P1 Infinite Lives
656DD7B800000003
   
All Gallery Pics
C6D864E0E0703041
9721AE1E
862C69BF0000FFFF
 
All Secret Options
D8AA88640000FFFF
  
All Score Attack Stages
85CC69B500000006
 

Thanks to Revolution readers Roy Fokker!