Doom Cheats & Tips

pause the game, hold L+R and press:
God Mode
A A B A A A A A
Complete Map
B A A A A A A A
Radiation Suit
B B A A A A A A
All weapons, items and keys
A B B A A A A A
Invincible
B B B A A A A A
Skip Level
A B A A B B A A

Press L & R in Pause Menu, then press he following buttons to activate the cheats

All Weapons, items and Keys:
A,B,B,A,A,A,A,A

Berzerk Mode:
B,A,B,A,A,A,A,A

Skip to Level, Tower of Babel:
A,B,A,B,A,B,B,A

Computer Map:
B,A,A,A,A,A,A,A