• All keys, weapons, full ammunition

Press Pause, # + Pause. | [Sent by DayleJ]
  • 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. | [Sent by DayleJ]
  • Fire weapons while in automap screen

Hold C + B. If the controls have been reconfigured, hold the buttons assigned to "Use" and "Fire". | [Sent by DayleJ]
  • Invincibility

Press Pause, * + Pause. Alternatively, press Pause, 9, 4, 7, 4, 9, 2, 1, 0.