Getting the Yellow Key / Getting to the Yellow Key Slot / Getting to the Exit

Use the Red Key to open the garage door slightly. Exit the garage and be prepared to fight two Alien Drones immediately, with two more appearing from behind the post office truck.

Search the post office truck for two Laser Tripbombs. To the right around the corner, find a Small Medikit and a Forcefield that can be deactivated to return to the level's start.

Across from the Red Key door, you'll see an overturned Post Office Truck and the Yellow Key door. Jump on top of the truck and enter its doorway to find an Atomic Health.

Proceed to the garage door and then to the sandbag barrier on the other side. Enter the fort and prepare for a series of enemy waves.

Notice two red circles on the path to the fort; these can be detonated by switches inside the fort. Wait until a large number of enemies are present before detonating them.

Inside the fort, collect numerous items: a Devastator, a Chaingun Cannon, Pipebombs, three Chaingun Cannon Ammo, a box of Shotgun Shells, RPG Ammo, three Pistol Ammo, a Portable Medikit, and Body Armor.

It's recommended to rig the outside of the fort with Pipebombs and Laser Tripbombs. Equip your Devastator, RPG, and Chaingun Cannon for the upcoming battles.

The first wave consists of Troopers. They will likely trigger your Laser Tripbombs. Use the Chaingun Cannon to eliminate any survivors.

The next wave includes Pig Cops and two Pig Tanks. They will keep their distance initially but will attack when close. Use the RPG extensively, prioritizing the Pig Tanks as they pose the greatest threat to reaching your fort. Detonate one of the explosion switches after dealing with the tanks.

Following the Pig Cops, a wave of Enforcers will appear. Use the last switch and then quickly eliminate them with the Devastator.

The final wave is a Battlelord. Defeat it with the Devastator, using the fort for cover if it approaches.

Once all enemies are cleared, the garage door opposite the fort will open. Enter to retrieve the Yellow Key, Devastator Ammo, and two Large Medikits.

Approach the Yellow Key door cautiously, as a second Battlelord is waiting. You have the option to skip this enemy.

The Yellow Key Door leads to a small hall that ends at the Exit Symbol.