Getting the Blue Key / Getting to the Blue Key Slot (10)

Start in the garage from the last level. Get the Pistol Ammo on the floor and open the door.

Kill the two Pig Tanks outside and get the Pipebombs in the corner and the Body Armor near the out-of-order garage door.

Hit the switch opposite the out-of-order garage door to open the door to the garage area.

Upon entering the garage area, you will be attacked by an Enforcer. Further in, two more Enforcers will attack from the left.

Collect the three Pistol Ammo on the ramp.

On the boxes, find a Shotgun on a lower box. Jump onto this box to reach a Small Medikit.

From the box with the Small Medikit, you can access an Atomic Health, RPG Ammo, Chaingun Cannon Ammo, and a Large Medikit on various boxes.

On the box with the Chaingun Cannon Ammo and Large Medikit, access a vent containing a Pipebomb and Night Vision Goggles (a piece of equipment that helps you see in the dark).

Near that box on the floor, find a box of Shotgun Shells.

Before going up the spiral staircase, ensure you have collected all desired items, as you cannot return to this area.

Go up the spiral staircase and open the door.

In the next room, two Enforcers will be firing on you. Run towards them, avoiding staying in the red-lighted room.

You can grab the Chaingun Cannon, Chaingun Cannon Ammo, and a Large Medikit in the red room while moving.

Kill the two Enforcers, ensuring you are not in the red room to avoid the ceiling collapsing on you.

SECRET 1: Instead of rushing, wait at the entrance of the explosions room. A secret door will open opposite your entry point. Inside, find an Atomic Health and a Teleport Pad. Using this pad teleports you into the room, but you must fight two Alien Drones and the two Enforcers if you didn't kill them earlier.

When the ceiling fully collapses, two small doors open on either side, each with an Alien Drone.

Find Chaingun Cannon Ammo in a corner, and two Large Medikits and two Small Medikits in various places.

In one of the rooms where an Alien Drone emerged, break a grate.

Drop into the water in the Trash Compactor. The walls will start closing.

Warning: You will be squished if you do not act quickly.

Find a switch underwater along with some Octabrains. Hit the switch to open a door opposite the grate you entered from.

In the Trash Control area, collect Pipebombs and Scuba Gear on the ground.

Find an Atomic Health and a Large Medikit in two small medical compartments.

SECRET 2: Interact with a computer to open a nearby door, revealing a Portable Medikit.

Proceed to the next room. At the end, the lights will turn off, and walls will open, revealing two Alien Drones.

Collect Chaingun Cannon Ammo at the end of the hallway.

Find a Devastator (a powerful weapon) and Microwave Expander Ammo where an Alien Drone emerged.

The door to the next room, which has lightning striking it, will open.

Enter this room, and two more walls will open with two more Alien Drones.

A switch on the left opens these doors if they close. Inside the left compartment, find Night Vision Goggles and a Small Medikit. Inside the right compartment, find a Pipebomb and a Holoduke (a decoy).

Go up the elevator at the other end of the room.

In the Box Room, defeat a Pig Cop near the entrance and two more around the corner.

On the stack of boxes nearest the entrance, find Steroids (a power-up).

Across from that, find boxes with a Portable Medikit on top.

In the center stack, find two Laser Tripbombs, Shotgun Shells, and a Large Medikit on top.

Enter the doors at the other end of the room.

Proceed down the Windows Room, encountering Enforcers that are good targets for Pipebombs.

After dealing with the Enforcers, get the Freezer (a weapon) on a shelf and enter the only non-locked door.

In the Office Room, prepare Pipebombs for four Pig Cops.

Find a Shotgun on a table, Body Armor on the computer, two Large Medikits on top of a file cabinet, and Chaingun Cannon Ammo in the trashcan.

On the wall are switches. Hit them in the order X O X X to unlock the compartment beside it, which contains the Blue Key.

Exit the Office Room and return to the Window Room.

Use the Blue Key in the slot in the Window Room.

In the Generator room, it is dark. Use your Night Vision Goggles.

Find five Octabrains and Slimer Eggs across the room.

Collect Freezer Ammo on the circumference of the generator.

SECRET 3: From the entrance, shoot the green canisters to the left. Enter the resulting crack in the wall to find an RPG (Rocket Propelled Grenade launcher).

SECRET 4: This secret requires a Jetpack (a power-up that allows flight). Jetpack up in the darkness to the platform opposite the entrance. Find a Shrink Ray (a weapon) and Devastator Ammo in this room.