Cheat Codes...
	Easter Egg: Nightmare...
	Enigma Codes...

First bring up the Dev console during gameplay with: CTRL + ~.

Effect	Code
Dumb AI	cvarAdd g_inhibitAi 1
God Mode	cvarAdd g_permaGodMode 1
Infinite Ammo	cvarAdd g_permaInfiniteAmmo 1
Unlock perks	DebugUnlockPerkByAbility -1
Unlock perks 2	DebugUnlockPerkByRequirement -1

Play for about a few hours into the game. Once you arrive at the headquarters of the resistance movement, go to the top floor. There's a mattress on the ground just left of the bulls-eye hanging on the wall. Focusing on the mattress will give you the option to enter a "nightmare." Enter the "nightmare" and you will find yourself in the very first level of Wolfenstein 3D.

Input the listed Enigma Codes to unlock various in game bonus' and modes (located in one of the Tabbed menus by pressing the "Tips and Hints" button)

Effect	Password
999 mode (UBER Difficulty, Health overcharged to 999 but lowers to health 100) and unlimited ammo.	ROW 1 -- (1,2,3,4,5,6,7,8,9) ROW 2 -- (8,7,6,5,4,3,2,1,9)
Hardcore mode (UBER Difficulty, No Health/Armor drops)	ROW 1 -- (3,6,9,3,6,9,3,6,9) ROW 2 -- (6,3,9,6,3,9,6,3,9)
Ironman mode (UBER Difficulty, 1 life/Permadeath)	ROW 1 -- (4,8,3,7,2,6,1,5,9) ROW 2 -- (5,1,6,2,7,3,8,4,8)
Walk in the Park mode (HUD disabled, Death Incarnate difficulty)	ROW 1 -- (2,4,6,8,1,3,5,7,9) ROW 2 -- (7,5,3,1,8,6,4,2,9)