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Extra Game Cheats:
INVINCIBILITY - Take no damage from bullets or explosions (SP only). CHEAT.
INFINITE AMMO - Never run out of ammo (SP only). CHEAT.
INSTAGIB - Enemies die in 1 shot and always gib (SP only). CHEAT.
ONE SHOT KILLS - Enemies die in 1 shot (SP Only).
MIRROR MODE - Draw the game mirrored horizontally (SP only).
GRAYSCALE MODE - Draw the game in grayscale (SP only).
GAME SPEED - Adjust game speed (SP only).
HEAD SCALE - Adjust head size of enemies and NPCs (SP only).
DUKE 3D FREEZE RAY - Freeze ray will fire bouncing ice projectiles (SP only)
INVINCIBILITY - Take no damage from bullets or explosions (SP only). CHEAT.
INFINITE AMMO - Never run out of ammo (SP only). CHEAT.
INSTAGIB - Enemies die in 1 shot and always gib (SP only). CHEAT.
ONE SHOT KILLS - Enemies die in 1 shot (SP Only).
MIRROR MODE - Draw the game mirrored horizontally (SP only).
GRAYSCALE MODE - Draw the game in grayscale (SP only).
GAME SPEED - Adjust game speed (SP only).
HEAD SCALE - Adjust head size of enemies and NPCs (SP only).
DUKE 3D FREEZE RAY - Freeze ray will fire bouncing ice projectiles (SP only)