Doom
# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
God mode
Pause the game, hold L + R and press A, A, B, A, A, A, A, A.
Invincibility
Pause the game, hold L + R and press B, B, B, A, A, A, A, A.
All weapons, items, keys
Pause the game, hold L + R and press A, B, B, A, A, A, A, A.
Berserk mode
Pause the game, hold L + R and press B, A, B, A, A, A, A, A.
Computer map
Pause the game, hold L + R and press B, A, A, A, A, A, A, A.
Radiation suit
Pause the game, hold L + R and press B, B, A, A, A, A, A, A.
Advance about 5 levels
Pause the game, hold L + R and press A, B, A, A, B, B, A, A.
Tower Of Babel level
Pause the game, hold L + R and press A, B, A, B, A, B, B, A.
Level Warp to "Tower of Babel:"
Pause the game, hold L + R and press A, B, A, A, B, B, A, A