MAP20: Breakdown (Doom 64)

MAP20: Breakdown is the twentieth level of Doom 64, designed by Randy Estrella. One of the most disturbing maps, large portions of this level shift and change completely, disorienting the player and making navigation difficult. It uses the music track, "The Rotted Foul".

Essentials
You begin in a courtyard-like square containing thick large stone columns in the center and an upper level that surrounds the square. In the very center of the square sits the blue skull key on top of a pillar that can only be brought down by shooting at a switch on one of the surrounding columns from the upper level. Many sergeants and cacodemons lurk throughout the square along with imps on the upper level. There are two switches located on two different columns opposite one another. Shoot the wrong one and a pair of cacodemons will appear which you will have to fight before shooting the other one. Once activated, the pillar with the blue skull key will lower to the ground. Collect the key, then activate the blue switch to advance to the next section of the map.

The next section is a blue stone corridor. From the courtyard square entrance, turn left and then right to drop down into a green room which will open in the middle to reveal a switch and a couple of Hell knights and nightmare imps to fight. Then hit the switch and go up the newly activated stairs, collecting the mega armor powerup along the way, then momentarily go to the back wall of the room to enter a secret alcove that contains a cache of rockets and a backpack. The switch activates a staircase which permanently blocks off the courtyard square and takes you to an upper level of the corridor which is more extensive. Many sergeants lurk here and you have to fight through them all in order to reach the end to activate a switch which opens another section of the upper level corridor. Make your way there and take out the spectres and baron hiding around the corner. Then go into the door to the left of the yellow door which takes you into a large open room with the red skull key resting in a pit in the middle. Take out the Hell knights on both sides of the door and then collect the key. Immediately the pit will raise to the level of the rest of the room and you will have to be ready to fight an onslaught of demons charging at you from every direction. There are three large sections connected to the room which house health bonus potions, which will help keep you alive as you slaughter the hoard of demons until they are all killed and their corpses disappear. Exit out of the room and go back downstairs and go right down the hall, then left to open the red bars blocking the switch you need to activate to open the final portion of the map.

The final section of the map is a large labyrinth of red stone infested with sergeants, imps, nightmare imps, Hell knights, barons, and lost souls. Navigate the labyrinth and kill them all. It will take some exploring find the switches that will help you navigate to the upper level of the labyrinth to collect the yellow skull key (to explain the exact routes would be confusing in text). After you collect the yellow skull key, you will have to dispatch a group of lost souls that appear and hide around some corners. Then exit the labyrinth and head for the yellow door located near the large room where you collected the red skull key. Inside the yellow door is an elevator which brings you down to the final room infested with nightmare imps. Kill them all and then jump into the small pit to exit the map.

Official

 * 1) (As aforementioned in the walkthrough) In the green room to the left of the corridor, after activating the switch and going up the stairs and collecting the mega armor, an alcove will open at the far end revealing a cache of rockets and a backpack. (sector 98)
 * 2) At the opposite end of the corridor from the green room is a wall next to the red stone columns which can be opened to reveal a soulsphere. (sector 85) Beware of the baron that also lurks in this hidden alcove.
 * 3) In the labyrinth a BFG9000 is stashed in a wall inside the catwalk entrance to small upper portion of the labyrinth, that can only be opened with a switch located in the space to the left of said entrance. You must be very quick as the wall only remains open momentarily for access, or you will have to hit the switch to try again. (sector 171)

Non-official
In the labyrinth, there are two additional secrets:
 * One is a plasma gun perched on top of a stone column near the entrance, across from the Hell knight cage. There is a switch up some stairs around the corner from it that will bring it down momentarily when activated so you can collect the weapon before it returns to its original position.
 * The other is a megasphere perched on top of a pillar like the plasma gun was, but this is only accessible from the upper catwalk portion of the labyrinth by entering a false wall that takes you on a branched off section of the catwalk which puts you in line with the mega sphere, and you will need to run jump to obtain it.

Things
This level contains the following numbers of things per skill level:

Trivia

 * This level was alleged to contain an extremely difficult to find secret which only a select few had supposedly discovered. An interview on Doom Depot revealed that this level was meant to contain an Easter egg involving the red key room that even its creators could not remember how to activate. Many players have searched for this secret, however, no player has ever successfully found it, and according to Doom 64 TC creator Samuel Villarreal (Kaiser), the egg seems to have been removed, with useless fragments of its activation (specifically, a number of mysteriously tagged walls) scattered around the play area. In Doom 64 EX, a Doom 64 clone that loads its data from a copy of the original ROM, it is possible to use standard Doom II cheats like . In doing so, you find that this Easter egg does not, in fact, exist. The Doom 64 TC version of this level restores the lost Easter egg, adding hidden switches and super secret 'shrine' rooms.