Map 26: The Abandoned Mines

Flip the switch straight ahead to lower the floor, revealing an opening with two Chaingunners. Eliminate them.

Let the floor raise back up. Look through the window to the right of the switch and use a powerful weapon (Chaingun or Plasma Gun) to eliminate enemies on a distant ledge (Chaingunners, Imps, Lost Souls).

Collect items in the starting room: health, armor, a Super Shotgun, and Shells.

Examine the wall behind your starting point to find a section with a different texture; this opens a hidden door [SECRET 1/4].

Kill the Spectre that attacks upon opening the secret door.

Proceed through the passage, eliminating a Shotgunner and a Chaingunner around the corner.

Enter a room with a wooden walkway. Kill another Chaingunner ahead and a third on a distant ledge to your left (shoot through metal bars).

Watch out for Lost Souls emerging from below on both sides of the walkway. Kill them all while collecting any items.

Slowly approach the end of the walkway without dropping off. When you reach the edge, doors will open.

Equip a heavy weapon and backtrack around the last corner of the walkway. A Cacodemon and a Mancubus will be in an opening in the far east wall; kill them.

Backtrack to near the entrance of this area. An opening in the far west wall contains three Cacodemons; kill them to prevent them from interfering with obtaining the Plasma Gun and other goodies.

Once all surrounding enemies are dead, return to the end of the walkway and drop into the slime pit.

Quickly turn left and run onto a teleporter. This warps you to the top of a pillar in the outer perimeter with a Small Cell Ammo pack.

Turn right, drop into the slime, and quickly run around the corner to grab a Radiation Shielding Suit.

Make your way around the perimeter of the outer area, collecting a Box of Rockets in the corner.

When you reach the teleporter, step on it to warp to a pillar in the inner slime pit area.

Take a couple of steps back for a run-up, then run forward to land on the next pillar and claim the Plasma Gun.

From the Plasma Gun pillar, turn right and run/drop back onto the walkway.

Return to the starting room. To find the second secret, press the initial switch again to lower the floor.

If enemies (like Cacodemons) are in the passage ahead, kill them.

Quickly run to the east side of the starting room and examine the wall to reveal a hidden door leading to a secret area [SECRET 2/4].

Enter the narrow passage for Shotgun Shells and a Backpack.

At the end of the passage, step out onto a small wooden ledge. Turn right and you'll see an opening at the bottom of the wall ahead with a pebble-floored texture.

Run into that opening. Be ready to fight a Chaingunner and an Imp when the floor ahead lowers.

After killing the enemies, collect the goodies in the room.

The floor may raise again. Hit the gargoyle head switch to re-lower it.

With the floor lowered, look to the left of the switch (facing south) and examine the wall with the electrical symbol. This opens a hidden passage with an Imp inside; kill it.

Wait for the floor to raise. You will now be on the ledge opposite the starting room where you initially shot enemies. Collect any remaining goodies here.

Step through the next opening.

As you collect Armor Bonuses, a wall on your left will open as you step over a thin metal strip. A Heavy Weapon Dude will be there; kill him first.

Enter the small room he was in to grab his dropped Chaingun and Medikits.

Continue along the previous passage to collect Health Bonuses, another Chaingun, and a Box of Rockets.

Examine the column with two gargoyle heads to raise it, allowing you to return to the starting room.

Turn around, equip the Plasma Gun or BFG9000 (if you have sufficient ammo), and step onto the teleporter to be taken to an outdoor area.

Several Imps and Lost Souls will attack immediately. Use heavy firepower to kill them.

Go past the opening on your left to find an Invisibility Sphere and a Medikit at the far end.

Before dropping through the opening below, fire down at the Mancubus in the trap area, trying to use the exploding barrels to your advantage.

Once the Mancubus is dead, safely drop down and collect the goodies: Health Bonuses, a Rocket Launcher, and Rockets.