Serious Sam - The First Encounter HD

Cheat Codes:
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At the menu, click down the Left-Analog stick and press Black, 
White, Y. The "Cheats" option will appear in the menu.


Developer Cheat Mode:
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At the main menu, click and hold the left analog stick in then press
black, white, Y, Y, Y, this Unlocks the cheat and developer cheat 
modes.


Unlockables Hidden Level:
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In the "Valley of the Kings" level, destroy all the statues.


Cheat:
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Submitted by: andy_kar

To apply cheat in this game, you have to enable cheats first. 
Go to installation directory>UserData, Then open SeriousSamHD.ini file with notepad.
Then find the line "cht_bEnableCheats = 0;". Replace the "0" with "1" and save the 
file. you should back-up the file before editing. Now close the file and start the game. 
When the game starts, press "Esc", at the pause menu, you will find the cheat option at 
the middle-bottom section of the screen. 
Click it, and there should be different cheats option, use whichever you like.