Enter the options menu and go into the passwords screen. Enter the cheats for their corresponding function:
- MANDARIN - "Achilles Head Mode"
- PUFFER - "Always Sniper" mode
- TANG - "Bullet Shield" mode
- TRIGGER - "Invisible Soldiers" mode
- HOGFISH - "Perfectionist" mode
- DAMSEL - "Rubber Grenades" mode
- GARIBALDI - All Replay Items
- SPINEFOOT - Huge Arms
- SEAHORSE - "Men With Hats"
- TILEFISH - "Silver Bullet Mode"
- GOBY - "Unlimited Ammunition"
- BUTTERFLY - "Unlocks All Missions"