Successfully complete the game to unlock the Army and Battle costumes. Successfully complete the game a second time to unlock the Ancient costume.
Successfully complete the game three times to view all endings. Then the grenade gun with infinite ammunition will be available at the start of the next game.
Successfully complete the game on the normal difficulty setting in under five hours.
Beat the game. Then start a new game using the last saved game file to access Army and Battle costumes. Then, successfully complete the game for a second time to obtain the Ancient outfit.
If you've played through to the end and chosen both Rick's and Gail's choices, then here's the final ending you're looking for. Have a feeling you've been through the game without visiting a few doors? You have. Three, to be exact. If you want to find it, you can simply access one of the Level A doors after you've chosen Rick or Gail's decision. All of the unexplored level A doors lead to the same tunnel system. Simply follow it the secret heliport, then check your map and visit the red room. The red room will vary for each choice, so make sure to check.
Type in 705037 at the vault. It will open and reveal the card to Dr. Kirk's secret lab in the control room
Here are the the two registration numbers you need for the ID Card:
| Person | Number |
| Dr. Kirk | 31415 |
| Mark Doyle | 57036 |
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