| Unlockable | How to unlock
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| Afraid of Monsters Hoodie | On a table in Harbor College in Chapter 4.
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| Awesome Hoodie | Watch all the endings (1,2,3,4 and 5) once.
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| Black Metal Hoodie | Beat the game with the 1st Ending.
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| Camera | Beat the game within 2.5 hours on any difficulty.
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| Camo Hoodie | Beat the game with the 2nd Ending.
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| Custom Hoodie | Unlock all the other hoodies.
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| David Leatherhoff Hoodie | Beat the game with the 5th Ending.
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| David Leatherhoff's Axe | In the 'Heaven' level, enter the code (26-16-4-27-49-2-32-45-12-23), get the axe and use it on a Twitcher to unlock it.
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| Doctor Mode | Beat the game once on any difficulty.
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| FAMAS (Infinite Ammo) | Beat the game on Nightmare difficulty.
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| Half Life Creations Hoodie | Found in a room at the Apartments in Chapter 1.
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| Hello Kitty Hoodie | Examine the dead cat in the vents in Chapter 4 until a message appears.
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| Hidden Package | Beat the game with the 4th Ending.
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| Mod DB Hoodie | Found in the kitchen of an apartment in Chapter 3 before the rooftops.
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| Nightmare Mode | Beat the game once on any difficulty.
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| Nightvision | Beat Doctor Mode.
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| Sick Simon Hoodie | Beat the game with the 4th Ending.
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| Simon's Book | Beat the game on Nightmare difficulty with an S Rank.
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| Team Psykskallar Hoodie | Beat the game with the 3rd Ending.
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| Twitcher Hoodie | Kill a Twitcher enemy by using David Leatherhoff's axe in the 'Heaven' level.
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