Press the green face and you will be lifted onto the platform. Head back out of the tunnels and go east outside. Jump back into the pit and use the teleporter in the southwest. Jump into the pit, ascend the rock stairs, and enter the northernmost passage. Proceed through it, slaying the monsters, until you find a cavernous area with flowing blood. Head downstairs in the southwest and reenter the hallway you left to find an open doorway leading into tunnels. Climb the northwest staircase and throw the switch to the southwest. Flip it and the rock wall to the east will fall to reveal a platform with a PT back to the Icarus along with a mysterious green face. Walk through the wooden arch at your destination and a switch will appear within it. Go east in the next passage, open the yellow door and step into the teleporter. Head around the northeast until you find a door back inside the building. Head back into the room with the torch and throw the switch to open the door out.īack in the hallway, open the yellow door and press the skull switch inside to open the exit outside. Take it, and then head around the walkway until you can drop down onto the yellow key. A door will open leading into a passageway, with an elevator at the northern end. Blast the barrel out of the way, clear the room beyond, and press the Use key facing the red torch in the west.

Climb onto the elevator it activates from the east side and a barrier will drop allowing access to another room. Flip it to open the door, head inside, and throw the switch in the northeast corner of the next room. Keep going east until you reach the end of the hallway and see a switch by a door to the south. From there, head behind the counter and open the blue door to the east. Once you have it, head back outside (the secret door can be opened manually from behind) and into the restaurant. At the end of the passage is the blue key. (You may try this as many times as you like until you make it.) Kill the monsters inside the berserk will help this go by faster. Run back out as quickly as you can and head through this door before it closes. This will open a secret door by the entrance outside, behind the puddle of blood. Enter the restaurant, fight off the monsters and activate the control panel near the restrooms. Kill any of the nearby shotgun guys and take their shotguns if you do not have one.

Sector, thing, and linedef numbers in boldface are secrets which count toward the end-of-level tally. Letters in italics refer to marked spots on the map.

Icarus cave map