Getting the Blue Key / Getting to the Blue Key Slot (8)

Start in the large parking lot. Collect Pistol Ammo and Pipebombs from a dumpster.

Proceed into the parking lot and fight an Alien Drone. Collect Pistol Ammo near a burning trash barrel and note the Mounted Gun above it.

Jump on the fire truck in the corner to find Atomic Health.

SECRET 1: On the fire truck, shoot a panel near the fire hydrant to open a door at the back. Jump through the burning window to enter and get the Devastator and Protective Boots. Hit the switch to the right of the entrance to exit this timed secret.

Enter the Post Office main doors. Destroy the Mounted Gun to your right.

Find a paw print on the wall in the main post office area and press it to open a compartment containing a Shotgun.

To your left, you will encounter a Pig Cop. Follow it further in to fight two more.

Find a Holoduke on one counter near a Wanted poster and a Small Medikit near another.

Activate a switch behind the counter to open mail shafts.

SECRET 2: The wanted poster can be opened to reveal a vent with Pipebombs behind some mail.

Enter one of the mail shafts and descend to the bottom.

Fight an initial Pig Cop, followed by an Enforcer. Collect Slimer Eggs from the floor.

Find an RPG on a mail stack and Shotgun Shells on a counter. Collect two Small Medikits in the area.

Proceed through the new path by going up the stairs.

Fight two Pig Cops at the top of the stairs.

As you turn the corner, prepare for an Enforcer, an Alien Drone, and a Pig Cop. Consider using a Pipebomb around the corner.

Enter the Locker Room. Collect Steroids from the bench.

Open the lockers: the farthest left contains a Large Medikit, the third contains the Blue Key, and the fourth contains Body Armor.

SECRET 3: Open the second locker from the left to reveal a secret room. Fight two Alien Drones behind a desk. Collect a Pistol and Pistol Ammo from sandbags. Find more Pistol Ammo near boxes and a Chaingun Cannon on top of them. A grate to a vent contains a Small Medikit. Go behind the sandbags to open a small cage with a Portable Medikit.

SECRET 4: In the same room, shoot the target in the middle of the dog picture on the wall titled "YOUR ENEMY". A small shelf opens to your left containing an Atomic Health and two RPG Ammo.