Go to the Hotel Hell level and go to the fountain by the pool. Step through the waterfall, then go behind a bush. You will see a radioactive waste sign like the ones that mark the end of a level, except it is gray. It will take you to the secret Freeway level.
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Shrapnel City: Tier Drops
There is a tenth level on Shrapnel City called Tier Drops. To get there, go to the movie level and go to the stage with the NASA sign and the body parts with a telescope. Kill the alien with the chain gun and press [Space] on the sign. A door should appear with the caution sign that ends the level. Do not go to the stage with the ship, or this will not work.
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Remain shrunk
Go to a level with a shrinker that shoots you to shrink. Jetpack up to the ceiling and when you grow, you will die. After dying, enable the dncornholio code and you will remain small. Note: If you walk over water or put a jetpack on, you will float towards the ceiling and stay there until you turn off the jetpack or float over the ground.
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More guns at final Boss
If you have a jet pack, fly up and destroy the beer blimp. Guns and health will scatter on the ground, allowing the final Boss to be killed easier. Note: One of the best weapons to use against it is the Devastater.
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Opponent viewpoint
Begin a modem multiplayer game and enable recording on the options screen. Press K during game play to view the game from your opponent's view point.
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Glitches
Double Mighty Foot
This is an extremely easy glitch to do, but only works in the original Duke Nukem 3D for DOS and variants.(Plutonium Pak, etc.) Simply select Weapon 1(Duke's Foot) then hold the Fire button. As you're doing this, hold down the Mighty Foot button as well. Duke is now kicking 1.5 times per kick! Not only that, but he's doing so using both his left and right feet at the same time. How gravity defying.
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God Mode in Damn, I'm Good
To use this, you must first active god mode in any difficulty level except Damn, I'm good. After that, wrap to a boss and kill it. Once you have done that, start a new game on Damn, I'm good and you'll be in god mode. This works until you go to a lower difficulty level and deactivate it or quit the game entirely.
