This walkthrough for Duke Nukem Forever Chapter 3: “The Duke Cave” will show you how to complete the third chapter of Duke Nukem Forever, unlock 4 achievements, and find all the ego cap rewards.
At the end of Chapter 2, Duke descended into his cave from his throne above. After the conference call from the President, there’s an alarm of an alien invasion. Head out the door behind the throne that you came in on to see what’s going on.
Go out the door and turn left to try to go out the second door. There will be an alien reaching through, and it will hurt you if you are too close when it is striking. Stay back when it is striking, and run up and hit it in between its strikes. Eventually, you will beat the alien to death. Then you have to force the door open by following the on-screen instructions.
When you get through the door, there will be the alien you just killed and several of Duke’s trophies on the ground. You are still unarmed, but you can pick up the trophies (“X” on the Xbox 360 controller) and throw them at enemies to hurt and / or kill them. If you kill 10 aliens with thrown objects, you will unlock the Duke Nukem Forever Downtown Barrel Beatdown Achievement for 15 gamer points. There are many throwable objects on this level, so it is a good place to unlock this achievement.
As you curve around the first hallway, you should come up on an alien whose back is turned. Kill it and then go through the door on the left. There are two aliens in Duke’s gym. Kill them, and then get ready for some ego cap rewards:
- Pick up and curl a handbell weight for +2 ego points.
- Put all the weights onto the bench press (there will be 3 weights on each side) and bench press the weights for +3 ego points.
- Punch the body bag for +1 ego point.
- Punch the speed bag for +1 ego point.
- Score a goal with a basketball for +1 ego point.
- Score 300,000 points on the pinball machine for +3 ego points.
After collecting all the ego cap rewards, go to the glowing vent on the wall and tear it off. Crouch down and enter the ventilation system to continue through the Duke Cave. To navigate the ventilation system, take your first right (you will see an alien crawl by in the direction that you should go). Take that section straight until you come to T. Turn left at the T, and follow the vent as it curves to the right. Then make a hard right, and go out of the open vent cover in front of you.
You come out of the vent into another hallway, and you pick up a beer right away. Don’t drink it now because you need it to unlock an achievement in a few minutes. Use whatever objects you can find to throw and kill the onslaught of aliens. Then continue up the hallway and through the door on the left.
In this section, some aliens will drop from the ceiling. After you kill them, there will be a power failure, and you have to use your Duke Vision (press up on the D-pad for Xbox 360). With your Duke Vision on, force open the door past the aliens you killed. When you are through, turn left and hop onto the pipes.
Turn right and walk down the pipes, crouching under overhanging pipes. When you reach the wall, turn right and continue down. Jump over the low-hanging pipes and turn right again. Then jump down onto the next layer of ventilation. Turn 180 degrees and walk along the ventilation shaft you are on, and turn left when you get to the end. Hop over a pipe onto some more pipes, walk to the end, and jump down to the next level of pipes. From there you can jump to the floor and kill the aliens in that room.
Force through the only door in that room and kill the alien on the other side. Turn right at the intersecting hallways and force through that door to kill two more aliens. After you kill them, find the glowing vent (it will be directly opposite the door your forced your way through). Punch through the vent cover, crouch down, and jump into the vent.
When you get to the bottom of the vent, circle over and around the pipes to get to the opening, which is blocked with trash cans (more throwable objects). Kill the aliens in this room. As you move forward and to the left, you will see two trash cans that are stacked up and supporting a pipe. Move those trash cans so that the end of the pipe falls down. Walk up the fallen end of the pipe past the midway point, and the pipe will raise up like a see-saw. When the end you walked up is in the air, run across it and jump onto the pipe in front of you. Walk all the way up that pipe, turn left, and go back into the ventilation system. At the end of the vent, punch out the cover and kill the alien in front of you.
In the room you are now in, you have to find and replace three energy cells back into the main reactor. The cells are only available one at a time, though. The first one will be to your left as you first come out of the vent, on top of a crate. When you collect it, place it into the reactor directly in front of you. Turn to your left, and the next energy cell will be on the crates by the wall, however you may need to kill another alien before you get to it. Place the second energy cell in the reactor.
After placing the second energy cell, some aliens will come out and try to kill you. Kill them instead, and go out the only working door in the room. Kill the aliens in that room, and continue through the next door. In this room, you will find a remote controller for a remote control car that you can see through the glass. You have to use the remote control car to push the last energy cell out of the vent on the far left side of the miniature obstacle course.
When you get the energy cell out of the vent, pick it up and take it back to the room with the reactor in it. Replace the energy cell, and you will be rewarded with some steroids. If you saved your beer, like I told you to, you can now take both the beer and the steroids to unlock the Duke Nukem Forever Substance Abuser Achievement for 10 gamer points, the Duke Nukem Forever 
Flagon of Chuckles Achievement for 5 gamer points, and the Duke Nukem Forever 
Juiced Achievement for 5 gamer points. All the aliens you now kill while under the influence of steroids will count towards your 15-alien total that’s needed to unlock the Duke Nukem Forever Duke Angry, Duke Smash Achievement; however, there aren’t enough aliens in this room to unlock that achievement yet.
After you kill the aliens in the reactor room, a door will open and two berserking pig cops will run out at you, so be ready. When you kill the pig cops, head through the door they came from and down the hallway. At the end of the hallway, you will receive another verbal warning from your computerized Duke Cave and a gun rack descends from the ceiling. This gun rack is holding Duke‘s Gold Pistol. This is the pistol that you must carry through the entire single-player campaign in order to unlock the Duke Nukem Forever Gunslinger Achievement (it’s 50 gamer points for unlocking this achievement, by the way, so it might be worth the trouble).
After you get your gun, walk through the door in front of you. There will be more aliens in this hallway. Kill them as you continue through the hallway. Take cover behind any crates as needed, and shoot the propane tanks on the sides of the hallway as explosives to kill the aliens with. When you make your way all the way around, you will find a room with an anti-aircraft cannon in it. Kill all the aliens circling around the cannon, and then get on it to end this chapter.
I hope you liked this walkthrough for Duke Nukem Forever Chapter 3: “The Duke Cave”. Continue to the next walkthrough for Duke Nukem Forever Chapter 4: “Mothership Battle” or go to the Duke Nukem Forever Walkthrough Table of Contents.
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