Getting the Blue Key

You'll start in an elevator that gets stuck. Kill the immediate Trooper. Grab the Pistol near the fire hydrant and enter the building with revolving doors to avoid street patrols by Pig Cops and their vehicles.

Inside the Gun Shop, kill the Pig Cop and Trooper. Take cover behind the counter to eliminate remaining Troopers. Find a Shotgun near a monitor.

SECRET 1: Jump on the shelves for Atomic Health. Open the wall nearby to find a Holoduke.

SECRET 2: On the wall with buttons, count four shelves from the counter and open that section to find Pipebombs and Body Armor.

Proceed through the hallway to the Peep Show Lounge. Watch out for a Pig Cop on the right; go left. Another Pig Cop is in the red-walled area, and a Trooper is at the end. Use Pipebombs in the first three booths containing enemies.

In the fourth booth, open the compartment for an RPG. Find Pistol Ammo in the trash can of the first booth, a Large Medikit in the second, and Steroids in the third.

In The Bathroom, blow up the crack in the wall to kill a Captain and Trooper. Press the switch near the mirror to get Night Vision Goggles.

Return to the Gun Shop and use the button combination X O X. Enter the dark room.

An elevator is at the end of the dark room. A Trooper guards the entrance to a hallway. Going right from here leads to another Trooper.

SECRET 3: Going right down the hallway leads to another branching path. The left path has a Pig Cop and Atomic Health; the right path has a Trooper.

Take the elevator to the Bedroom. Kill the two attacking Troopers. Grab the Chaingun Cannon and ammo from the bed. Open the compartment for the Blue Key. Find a Large Medikit in the trash can.

Around the corner, kill two more Troopers and collect Chaingun Cannon Ammo.

Near the window, hitting a switch makes a "Duke Nukem Must Die!" sign fall across the street (cosmetic).

From the bedroom, you can easily kill Pig Cops in RPVs and other enemies across the street with the Chaingun Cannon and Pipebombs.