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)