Infinite flares
Highlight "Flare", enable it, but do not throw it down. When it is low, press Left or Right and highlight another object. Then, highlight "Flare" again. It will have restarted and you will not lose another one.

Hidden trailer
Wait about one minute at the main menu to view a longer, uncut television trailer for the game.

Persuade a person
When someone's trust is in the orange and they will not do anything for you, enter first person mode and aim the gun at their head for three seconds. They will now do things for you without good trust.

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Game Shark Codes

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Master Code (Must Be On) 0E3C7DF2 1853E59E
EE8C6406 BCBCD3EA

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Infinite Health DEBD6E92 F8AADD4B
DEBD6E9A 6AAA9B1F

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Infinite Ammo DE4E515A E0AC9BB5