American Psycho Reference
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
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| - Get 250 kills with the Shotgun (Burger Face III).
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| - Get 75 kills with pipe bombs (Splatter King III).
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| - Get 250 kills with the Enforcer (Laser Seeking Missiles III).
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| - Get 75 kills with the Garter Pistol (Tiny But Deadly III).
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| - Get 250 kills with the Ripper (Swiss Cheese III).
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| - Get 250 kills with the Rocket Launcher (Boom Goes The Weasel III).
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| - Get 75 melee kills (Punchy McPuncher III).
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| - Get 250 kills with the Railgun (Right In The Eye III).
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| - Get 75 kills with trip mines (Watch Your Step III).
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| - Get 250 kills with the Pistol (Size Doesn't Matter III).
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| - Get 250 kills with the Devestator (Meat Grinder III).
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| - Execute a frozen player 75 times (Ice To See You III).
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| - Get 250 kills with the AT laser (Medium Rare III).
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| - Stomp on 75 enemies (Pee Wee Vermin III).
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| - Get 75 kills with Steroids (Roid Rage III).
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| - Get 75 kills with exploding barrels (Smile You Son Of A Bitch III).
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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.
Easy "Air-Duke" achievement
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.
Easy "Balls Of Steel" achievement
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.
Easy "Bucket Head" achievement
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.
Easy "Companion Barrel" 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.
Easy "I Am All That Is Man" 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.
Easy "I Need A Date" achievement
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.
Easy "Party Animal" achievement
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.
Easy "Pescaphobe" achievement
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.
Easy "Sticky Bomb Like You!" achievement
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.
Easy "Sunday, Black Sunday" 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.
Easy "Turd Burglar" 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.
Extra options for next playthrough
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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| - Freeze ray will fire bouncing ice projectiles (SP only).
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| - Adjust game speed (SP only).
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| - Draw the game in grayscale (SP only).
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| - Adjust head size of enemies and NPCs (SP only).
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| - Never run out of ammo (SP only).
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| - Enemies die in 1 shot and always gib (SP only).
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| - Take no damage from bullets or explosions (SP only).
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| - Draw the game mirrored horizontally (SP only).
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George Lucas THX 1138 Movie Reference
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.
How to get 'No One Likes a Whiner'
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
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| - Defeat the Battlelord on the Hoover Dam.
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| - Win air hockey with a score of 7-0 in the strip club.
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| - Earn a 1,000,000 pinball score in SP.
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| - Shoot down 20 alien fighters.
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- Beating the One-Eyed Worm
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| - Blow up 5 enemy gunships or dropships.
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| - Find all 3 helmets in the SP campaign.
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| - Listen to all phone messages.
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| - Complete the SP campaign on Hard Difficulty.
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| - Unlock the secret closet at the end of the Forkstop.
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| - Complete the SP campaign on Insane Difficulty.
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| - Kill 10 aliens with environmental explosives.
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| - Doodle something on the whiteboard in SP.
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| - Kill 15 aliens with melee attacks while on steroids.
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| - Kill 6 aliens with the forklift.
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| - Get knocked down 10 times.
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| - Carry the gold pistol through the whole SP campaign.
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| - Discover all ego cap rewards.
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| - Look at every page of a calendar in SP.
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| - Get hit by 10 Pregnator bombs.
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| - Complete the SP campaign on Normal Difficulty.
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| - Win a game of Alien Abortion in the strip club.
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| - Knock out the talent at the talk show.
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| - Eat 10 pieces of food during the SP campaign.
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| - Kill 30 aliens with headshots.
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| - Drink all of the beers in the strip club.
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| - Kill all of the catfish in the underwater level.
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| - Complete the SP campaign on Easy Difficulty.
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| - Defeat the Battlelord in Las Vegas.
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| - Kill 15 aliens with the monster truck.
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| - Watch the credits all the way through.
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| - Put a Trip Mine on a live alien.
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| - Drink beer while on steroids or vice-versa in SP.
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| - Shoot down the blimp above the stadium.
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- Tosser... in the Literal Sense
| - Kill 10 aliens with tossed objects.
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| - Kill 10 aliens with trip mines.
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| - Find and steal a piece of poo.
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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.
The Doctor Who Cloned Me: Steam Achievements
| Achievement | How to unlock
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|---|
| - Beat the DLC campaign on Easy Difficulty.
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| - Kill 30 enemies with the moon rover.
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| - Kill 10 expanded enemies with melee attacks.
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| - Beat the DLC campaign on Hard Difficulty.
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| - Beat the DLC campaign on Expert Difficulty.
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| - Discover and reject the video game that lets you slap women.
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- I Am All That Is Man - Again!
| - Discover all Ego cap rewards in the DLC campaign.
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| - Beat the DLC campaign on Normal Difficulty.
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| - Let 20 enemies die by someone else's hand.
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| - Earn a 1,000,000 pinball score on the Scientits pinball machine.
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| - Kill 3 enemies within 3 seconds with the Impregnader.
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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.
More Cheats, Tips, Secrets & Walkthroughs
