Final Doom/MAP08: Metal

This level contains a high quantity of ambushes and traps. As such, you should expect a high quantity of

At the start, you are confronted by a sargent. Shoot him quickly without moving, and take care of the two zombies waiting in ambush. There are also two other sargents waiting in ambush as well in the corridor fork ahead.

If you want to the right, you'll get access to an early chaingun from an enemy (on Ultra Violence/Nightmare only), although watch for a single imp ambush to the left. You can go past the room and right again for a partial invisibility, but the monsters in that region are alert for an ambush.

The next area is to the left of the entrance, and is the first branch to the right. Kill the imp that awakens behind you and open the door. Kill three sargents, and climb the darkened staircase (opening two heavy weapon dudes behind and to the left). If you fall off the right of the staircase, you'll awaken upto four monsters that teleport to various regions within the area.

Past the staircase, you should see a large area with imp cages. If you want access to the armor and super shotgun, you need to shoot the imps in the left cage and fight the monsters coming from the four corners of the map. Regardless of your choice, head north.

The next area has a window going outside showing a red key. To get access to it, look for a marked wall on the right, and activate it. The small corridor has a few ambushes:
 * After the first turn, enemy closets are opened both in front and behind you at the same time.
 * Before the switch, there is a Heavy Weapon Dude.
 * When you approach the switch, a Spectre is released from behind. Also, you are lowered to a Heavy Weapons Dude who attacks from the right.
 * On return, a monster closet opens on the route back.

After flipping the switch, return and pickup the red key. This causes the outside to be sealed, and causes monsters to be released on the left and right edges of the outside area. To lower the seal, flip the switch behind the right group of monsters (although you can bypass the seal by climbing up onto the partially raised floor and through the window.)

Go to the Red key gate. In the next room, you should find a switch which opens a previously blocked passageway to more armor and partial invisibility. It also reveals the TNT logo within the same room.

The final room is a large arena of monsters. Firing once will cause monsters to teleport throughout the arena. The arena has switches in pairs; the left switch in a pair raises the floor, and the right switch should lower the given floor to the ground.
 * 1) The first switch is on the left wall from the entrance.  Flip the switch and quickly back away onto the raising lift.  Jump onto the nearby platform, fight the monsters, and flip the switch there.
 * 2) The second switch is on the opposite side of the entrance.  Flip the left switch, and hold position.  Flip the right, and ride up the lift and jump in and flip the switch behind the newly raised wall.
 * 3) The third switch pair is left of the second.  Simply approach the pair to be teleported to the third platform.  Defeat the monsters and continue.
 * 4) The fourth switch pair is on the wall right of the entrance.  However, ignore the left switch and go directly to the right one.  It quickly opens a door the right, which provides access to a lift.  When you approach the lift, shoot the spectre that appears from the door opening from behind.  Go up and defeat the monsters there.

After getting all four switches, the exit opens on the left hand wall. You can bolt to the exit, or defeat the monsters at your leisure.

Secrets
There are four secrets on the map, some of which have no visual indication about them.
 * 1) Use the otherwise unremarkable wall immediatly left of the entrance doorway (where player 1 spawns).  The entrance door reveals a chainsaw.
 * 2) In the middle room past the darkened staircase and before the red key door, shoot the left cage of imps with a bullet.  The doors on the right will open; entering the southern door has a switch which counts as a secret.  Using it will lower the green armor and super shotgun.
 * 3) In the area overlooking the red keycard, head to the southwest alcove.  Use the wall behind the two lamps to head down to a secret supercharge.
 * 4) You need to lower the path to the red key, walking through the doorway to the switch is a secret itself (and is unavoidable).

Deathmatch

 * A shotgun appears at the bottom left corner, in the water tunnels.
 * Another shotgun appears on the path to the partial invisiblity, behind the red key gate.
 * A rocket launcher appears in the supercharge secret.