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How to unlock Survival! Mode
It will only work if you select the Difficulty Hardened or Veteran. Once you do this, your original save will be no more. It will not work on Green.
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Play and beat the game on Veteran Mode, then it will ask if you want to switch to survival mode. Select yes and it will switch to Survival Mode.
Survival! Mode
Unlockable
Complete the following tasks to unlock the corresponding cheats
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Complete the game on Hardened, or complete the game with all Gold medals
Infinite Health
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Complete the game on Green, or complete the game with all Bronze medals
Infinite Ammunition
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Complete the game on Veteran, or complete the game with all Silver medals
Infinite Grenades
