By completing the game on any difficulty, you will get to unlock extra options for your next playthrough.
Unlockable | How to unlock
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Duke 3D Freeze Ray | Freeze ray will fire bouncing ice projectiles (SP only).
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Game Speed | Adjust game speed (SP only).
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Grayscale Mode | Draw the game in grayscale (SP only).
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Head Scale | Adjust head size of enemies and NPCs (SP only).
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Infinite Ammo | Never run out of ammo (SP only).
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Instagib | Enemies die in 1 shot and always gib (SP only).
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Invincibility | Take no damage from bullets or explosions (SP only).
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Mirror Mode | Draw the game mirrored horizontally (SP only).
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