Getting the Blue Key / Getting to the Blue Key Slot (12)

Entrance: Start in an opening with a shack and a hallway to an elevator. Find two Pipebombs and two boxes of Shotgun Shells. Use a Pipebomb on the shed to reveal a button and a Pistol. Press the switch, take the elevator up (grabbing extra Pipebombs), and enter the room with a Chaingun Cannon, Large Medikit, and a Teleport Pad.

Outside: Spawn behind a trailer. Two Pig Cops will immediately attack. Avoid the area behind the trailer if low on ammo due to Pig Tanks and other enemies. Deal with RPVs if possible. To the left of your spawn, find a Large Medikit and a Small Medikit. Near a platform with a fan, there's a Trooper and a Small Medikit. Break the fan.

Service Entrance: Jump down the shaft. You may fall through a second fan at the bottom, where Body Armor can be found. Break the fan to exit. A switch inside the shaft leads to the Command Room.

Command Room: Two Pig Cops are present. Find Chaingun Cannon Ammo on one side of the chair. When you approach the Blue Key, doors will open, revealing two Enforcers, two Pig Cops, and a Trooper. Use the ramps for cover (note the Forcefield). Observe the command chair's codes for later reference. After defeating enemies, collect Pipebombs and two Small Medikits from the room they emerged from, then use the Teleport Pad.

Back Outside: You'll be in a small room above the fan platform. A Trooper guards a Shotgun on a platform. Jump down and return to the trailer area. Expect a tough fight with Troopers, Pig Tanks, and any remaining RPVs. Collect the spoils: two RPG Ammo on top of the trailer. From the trailer, enter a cave containing Night Vision Goggles and a Large Medikit. Near the Blue Key door, find Pistol Ammo (a Mounted Gun is above it). In a corner, there are six Pipebombs, Chaingun Cannon Ammo, and a Large Medikit. Use the Blue Key on the Blue Key door.