American Psycho Reference...
	Bonus accessories...
	Cheats in Extras menu...
	Christian Bale reference...
	Dead Space reference...
	Easy "Air-Duke" achievement...
	Easy "Balls Of Steel" achievem...
	Easy "Bucket Head" achievement...
	Easy "Companion Barrel" achiev...
	Easy "I Am All That Is Man" ac...
	Easy "I Need A Date" achieveme...
	Easy "Party Animal" achievemen...
	Easy "Pescaphobe" achievement...
	Easy "Sticky Bomb Like You!" a...
	Easy "Sunday, Black Sunday" ac...
	Easy "Turd Burglar" achievemen...
	Extra options for next playthr...
	George Lucas THX 1138 Movie Re...
	How to get 'No One Likes a Whi...
	Inception reference...
	Master Chief's Armor...
	Microwaved rat...
	Overdrive Mode...
	Steam Achievements...
	Sunday, Black Sunday...
	The Doctor Who Cloned Me: Stea...
	Tommy Tutone reference...
	Turd Burglar...

In the Duke Nukem's "Titty City" chapter, there are two ATM machines, one near the bar and one near the slot machines in the game room. Go up to one and use it it will say "card read error", press action again and it will say "Feed me a stray cat" -- it works on both of them but it won't repeat again. This is a reference to the scene in American Psycho when Patrick Bateman tries to use an ATM machine and it appears to him to say "Feed me a stray cat" and he tries to before a woman yells at him and he runs off.

Successfully complete the indicated multiplayer weapon challenge to unlock the corresponding accessory in the changing room.

Accesory	How to unlock
Backwards Baseball Cap	Get 250 kills with the Shotgun (Burger Face III).
Baseball Cap	Get 75 kills with pipe bombs (Splatter King III).
Brain Sucker	Get 250 kills with the Enforcer (Laser Seeking Missiles III).
Canadian Flag Logo	Get 75 kills with the Garter Pistol (Tiny But Deadly III).
Cheese Hat	Get 250 kills with the Ripper (Swiss Cheese III).
Detonator Logo	Get 250 kills with the Rocket Launcher (Boom Goes The Weasel III).
Hoplite Helmet	Get 75 melee kills (Punchy McPuncher III).
I Shot Stupid Logo	Get 250 kills with the Railgun (Right In The Eye III).
Jester Hat	Get 75 kills with trip mines (Watch Your Step III).
Military Hat	Get 250 kills with the Pistol (Size Doesn't Matter III).
Retro Duke Logo	Get 250 kills with the Devestator (Meat Grinder III).
Ski Goggles	Execute a frozen player 75 times (Ice To See You III).
Tie-Dye Shirt	Get 250 kills with the AT laser (Medium Rare III).
Uncle Sam Hat	Stomp on 75 enemies (Pee Wee Vermin III).
Wolf Logo	Get 75 kills with Steroids (Roid Rage III).
WTF Logo	Get 75 kills with exploding barrels (Smile You Son Of A Bitch III).

Beat the game and you can activate these cheats in the Extras menu.

Duke 3D Freeze Ray
Grayscale Mode
Head Scale
Infinite Ammo
Instagib
Invincibility
Mirror Mode

In Chapter 2: "Damn! It's Late...", after walking off the set, you will see an actor yelling at someone. He says things like "Do you want me to trash your mics? DO YOU?" and "You're a nice guy, you really are but you're a f**king amateur". This is a reference to when Christian Bale freaked out on the set of Terminator: Salvation.

In "The Hive" chapter, after you tickle the first door, turn to your left, and walk forward. Crouch to get under the bridge, and you will see a dead EDF Soldier with Isaac Clarke's signature engineer helmet.

In the "Duke Nukem's Titty City" chapter, go to the game room at the back of the club, and play a game of air hockey. Instead of focusing on scoring, try defending your goal as good as possible. The rest will happen by accident since the opponent is very weak.

Pinball games are located in different locations throughout the game. The first pinball game can be found in "The Duke Cave" chapter. While playing the pinball game, to speed things up, you should get at least a x2 multiplier without wasting a ball. Hold the top left flipper, and bring the ball up there. Quickly release the flipper, and let it hit the three panels. If the ball is getting too far on the right side, you can tilt the table to the left. Keep repeating this method. Do not use the tilt ability more than once every five seconds. If you use it too often, you will lose control over the flippers.

The first helmet is at the very beginning of the "Vegas In Ruin" chapter in the back of a vehicle. The second helmet is at the beginning of "The Hive" chapter. Turn left after going through the first alien hole to find it. The third helmet is found in the "Blowin' The Dam" chapter. After planting the first bomb and fighting two octopuses, swim to some debris to your left to find it and get the "Bucket Head" achievement.

In Part 2 of "The Forkstop" chapter, you will reach a large area where you need to turn the power on. After killing some waves of enemies, use the forklift, and climb the wall to your right. Grab the heart barrel, and go to the other side. Place the barrel on the blue heart drawing on the ground to open the secret room and get the "Companion Barrel" achievement.

There are 28 Ego Awards. There are a couple extra rewards that are gained automatically by playing through the story. If you get all Ego Awards during your first playthrough, you will get the "I Am All That Is Man" achievement in the "Blowin' The Dam" chapter.

In "The Shrunk Machine" chapter, near the beginning, after entering the first large room, straight ahead across the room are some double doors. There is a calendar on the wall behind the double doors. Look at all pages to get the "I Need A Date" achievement. There is another calendar in Part 2 of "The Forkstop" chapter on the wall in one of the rooms.

In the "Duke Nukem's Titty City" chapter, drink all nine beers in the strip club to get the "Party Animal" achievement. One beer is behind the locked door. The code is "4768". Get all the other items that are required to proceed with the chapter. After giving the items to the stripper, you can enter the last room.

In the "Blowin' The Dam" chapter, kill all 15 catfish to get the "Pescaphobe" achievement. Turn on your Duke Vision to detect them much easier.

At the beginning of "The Duke Dome" chapter, you will get an infinite amount of explosives when entering a building. Throw a trip mine directly on one of the enemies to get the "Sticky Bomb Like You!" achievement.

In the "Duke Lives" chapter, at the very beginning of your first fight, you will see a blimp in the background. Keep shooting it until you get the "Sunday, Black Sunday" achievement.

Poop can be found in toilets. There is some poop in the toilets in the room where the game begins ("Duke Lives" chapter). Grab poop from a toilet and throw it to get the "Turd Burglar" achievement.

By completing the game on any difficulty, you will get to unlock extra options for your next playthrough.

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

The code Duke types into the big gun to be used on the mothership mission at the end of the Duke Cave mission is 1138.

In the second chapter "Damn its late" you will run into a complaining actor yelling at a guy for walking through the set. Punch the actor to get "No One Likes a Whiner."

In the "Duke Nukem's Titty City" chapter, enter the room where you can microwave the popcorn. Look on the desk where you can use the security camera, and you will see a spinning top, like the one Leonardo DiCaprio uses in Inception.

In the beginning of Vegas in Ruins, the 'power armor' in the armor crate at the start of the level is none other than that of a Spartan -- and Master Chief's classic green and orange color scheme, no less.

In Chapter 2: "Damn! It's Late...", there is a room with a microwave. Directly under the microwave is a cupboard that can be opened to find a rat. You can pick up the rat and put it in the microwave. Note: This room is also shared with the Duke Nukem Fanboy.

Get to Level 40 in multiplayer to unlock Overdrive Mode. Outside of Challenges, all points are doubled in Overdrive Mode.

Achievement	How to unlock
A Good Dam Fight	Defeat the Battlelord on the Hoover Dam.
Air-Duke	Win air hockey with a score of 7-0 in the strip club.
Annihilation	Kill 100 aliens.
Balls of Steel	Earn a 1,000,000 pinball score in SP.
Baron von Nukem	Shoot down 20 alien fighters.
Beating the One-Eyed Worm	Defeat the Energy Leech.
Big Guns, Big Ships	Blow up 5 enemy gunships or dropships.
Bucket Head	Find all 3 helmets in the SP campaign.
Call Waiting	Listen to all phone messages.
Come Get Some	Complete the SP campaign on Hard Difficulty.
Companion Barrel	Unlock the secret closet at the end of the Forkstop.
Damn, I'm Good	Complete the SP campaign on Insane Difficulty.
Dead Useful	Kill 10 aliens with environmental explosives.
Drawrings	Doodle something on the whiteboard in SP.
Duke Angry, Duke Smash!	Kill 15 aliens with melee attacks while on steroids.
Extermination	Kill 50 aliens.
Flagon of Chuckles	Drink a beer in SP.
Fork the Pork	Kill 6 aliens with the forklift.
Freeze Well!	Kill 15 frozen aliens.
Full Body Tourettes	Get knocked down 10 times.
Gunslinger	Carry the gold pistol through the whole SP campaign.
He's Got a Hologram!	Use a Holoduke in SP.
Hippy-Stomper	Foot stomp 12 aliens.
I Am All That Is Man	Discover all ego cap rewards.
I Need a Date	Look at every page of a calendar in SP.
I Need a Towel	Get hit by 10 Pregnator bombs.
Judge, Jury, Executioner	Execute 20 aliens.
Juiced	Take steroids in SP.
Let's Rock	Complete the SP campaign on Normal Difficulty.
Lots of Whacking	Win a game of Alien Abortion in the strip club.
Natural Disaster 3x	Kill 3 aliens at once.
Nobody Likes a Whiner	Knock out the talent at the talk show.
Noms	Eat 10 pieces of food during the SP campaign.
Not Bad for a Human	Defeat the Alien Queen.
Nuclear Devastation	Kill 250 aliens.
Octacide	Defeat the Octaking.
On the Noggin'	Kill 30 aliens with headshots.
One-Eyed Freak	Defeat the Cycloid.
Party Animal	Drink all of the beers in the strip club.
Pescaphobe	Kill all of the catfish in the underwater level.
Piece of Cake	Complete the SP campaign on Easy Difficulty.
Pit Champion	Defeat the Battlelord in Las Vegas.
Road Rage	Kill 15 aliens with the monster truck.
Special Thanks	Watch the credits all the way through.
Sticky Bomb Like You!	Put a Trip Mine on a live alien.
Substance Abuser	Drink beer while on steroids or vice-versa in SP.
Sunday, Black Sunday	Shoot down the blimp above the stadium.
Tosser... in the Literal Sense	Kill 10 aliens with tossed objects.
Trapper	Kill 10 aliens with trip mines.
Turd Burglar	Find and steal a piece of poo.

When you face the Cycloid in the first chapter "Duke Lives" there will be a blimp flying across the football stadium. Shoot the blimp until it is on fire to get Sunday, Black Sunday.

Achievement	How to unlock
Another Piece of Cake	Beat the DLC campaign on Easy Difficulty.
Bloody Red Rover	Kill 30 enemies with the moon rover.
Bubble Buster	Kill 10 expanded enemies with melee attacks.
Come Get a Little More	Beat the DLC campaign on Hard Difficulty.
Damn, I'm REALLY Good	Beat the DLC campaign on Expert Difficulty.
Heart to Heart	Finish Doctor Proton.
Hedonist, not Misogynist	Discover and reject the video game that lets you slap women.
I Am All That Is Man - Again!	Discover all Ego cap rewards in the DLC campaign.
Let's Rock Out	Beat the DLC campaign on Normal Difficulty.
Passive Aggressive	Let 20 enemies die by someone else's hand.
Scientits	Earn a 1,000,000 pinball score on the Scientits pinball machine.
Threesome	Kill 3 enemies within 3 seconds with the Impregnader.

In the bathroom in the "Duke Nukem's Titty City" chapter, above one of the urinals is some grafitti that reads "Jenny - 867-5309". This is a reference to the Tommy Tutone song of the same name.

In the first stage, Duke Lives, look for the toilet stalls. You'll get a button prompt here to pull a turd out of the toilet for the Turd Burglar Achievement.