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