Enter Square, Triangle, Circle, X, Circle, Triangle as a password to enable cheat mode. Ignore the "Invalid Code" response. Then the following cheats may be activated:
- Level select
Enter Circle, Circle, Triangle, X, Square, Square as a password. Ignore the "Invalid Code" response. Then, begin a new game and press Start during the game. Press Circle to select the "Resume" option. Any level in the game may now be accessed.
- Invincibility
Enter Triangle, X, Triangle, Triangle, Square, Circle as a password. Ignore the "Invalid Code" response. Then, begin a new game. Note: Activating this code may disable sprite collision and the Use command.
- Permanent shield
Enter Square, Circle, Circle, Square, Triangle, X as a password. Ignore the "Invalid Code" response. Then, begin a new game to have a shield that is always full. Note: You can still die other ways.
- View FMV sequences
Enter Square, X, Circle, Triangle, Circle, X as a password. Then a FMV player will appear.
- Invincibility
| Area | Password | |
| The Prison | Square, Circle, Triangle, X, Circle, Square | |
| Morph Base | Triangle, Circle, X, Circle, Square, X | |
| Mars Mining Facility | X, Circle, X, Circle, Triangle, X | |
| Venus Space Station | X, Square, Triangle, Circle, Circle, Triangle | |
| The Pyramid | Square, Square, Triangle, X, X, Triangle | |
| Landing Pad | Triangle, X, X, X, X, Circle | |
| Underground (flying) | Circle, Circle, Triangle, X, Triangle, X | |
| Morph Mothership | Square, Square, X, Triangle, Square, Square | |
| Earth Base: Command Room | Triangle, X, X, Triangle, Circle, Triangle | |
| Earth Base: Dormitory | X, Triangle, Square, Circle, Triangle, X | |
| Reactor Room | Circle, Square, X, X, Square, X | |
| The Master Brain | Square, Triangle, X, Square, Circle, X | |
| The Escape (flying) | X, X, Circle, Triangle, Circle, Triangle |
Note: Level 13 only appears if Sarah is not saved.
| Infinite Health | 801C0330 07D0 801B37DC 07D0 801B4AE4 07D0 801B59C0 07D0 801C7F68 07D0 801AAD9C 07D0 801AAD9C 07D0 801B6BAC 07D0 801B50BC 07D0 801B6F64 07D0 801B5C84 07D0 801B0960 07D0 801B85CC 07D0 801B3280 07D0 |
| Infinite Normal Bullets | 801BE0D4 0009 |
| Infinite Heat-Seaking Bullets | 801BDB34 0009 |
| Infinite Plasma Bullets | 801C04AC 0009 801C476C 0009 |
| Infinite Explosion Bullets | 801BDEF4 0008 801BFD54 0008 801C1218 0008 801D6D18 0008 801B1794 0008 |
| Infinite Armor Bullets | 801BFB74 0009 801C1038 0009 801D6B38 0009 801B15B4 0009 801C4B2C 0009 801C021C 0009 |
| Infinite Mines | 801CEE88 0003 |
| Infinite Time (Watch) | 800ACACC 0000 800AF9A4 0000 |
Note: Turn the Game Shark off between levels, because some codes may freeze the game.





















