Here are some cheats and tips for the game Doom.
Cheat mode:
Enter one of the following codes during game play to activate the
corresponding cheat function. Note: Codes may not be enabled during
Co-op or Deathmatch modes.
Invincibility
Press Pause, * + Pause. Alternatively, press Pause, 9, 4, 7, 4, 9,
2, 1, 0.
All keys, weapons, full ammunition
Press Pause, # + Pause.
Fire weapons while in automap screen
Hold C + B. If the controls have been reconfigured, hold the buttons
assigned to “Use” and “Fire”.
Deathmatch or Co-Op more music:
Begin a multiplayer game in Level 23. Complete the level, then reset
one of the Jaguars during the ending text. Start a new Deathmatch or
Co-Op game on the Jaguar that was reset to play music during the next
game in the place of sound effects.
Level Select:
Press one of the following codes during game play to begin at the
corresponding level.
Level Code
1 1 + Pause
2 2 + Pause
3 3 + Pause
4 4 + Pause
5 5 + Pause
6 6 + Pause
7 7 + Pause
8 8 + Pause
9 9 + Pause
10 A + Pause
11 1 + A + Pause
12 2 + A + Pause
13 3 + A + Pause
14 4 + A + Pause
15 5 + A + Pause
16 6 + A + Pause
17 7 + A + Pause
18 8 + A + Pause
19 9 + A + Pause
20 B + Pause
21 1 + B + Pause
22 2 + B + Pause
23 3 + B + Pause
24 4 + B + Pause