MAP17: House of Thorn (Memento Mori)

MAP17: House of Thorn is the seventeenth level of Memento Mori. It was designed by Eric Sambach, and uses the music track "Dreadnaught" by Mark Klem.

Walkthrough

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

Secrets

 * 1) Inside the attic you start the level in, the southwest cellar contains a lantern on a wall; shoot this wall to reveal a box of shells. (sector 173)
 * 2) When the elevator after the attic is lowered, the southwest wall can be walked through, leading into a compartment containing a soul sphere. (sector 309)
 * 3) The sector containing the switch in secret #2 that lowers the elevator is also marked as secret. (sector 316) However, it is impossible to register due to being too small for the player to enter.
 * 4) Upon leaving the attic, enter the marble room in the northeast of the house and press on the demonic face at the south.  It will open a portion of the eastern wall to reveal a blur artifact. (sector 253)
 * 5) In the library where the blue keycard resides, press on the bookcase west of the couch.  It will unveil a secret room behind the desk containing a backpack, a shotgun, a chaingun, and a super shotgun.  (sector 113)
 * 6) After descending either elevator in the stone area following the yellow key door, the wall east of the eastern torch is covered in muck.  Press on this wall and the platform between the elevators will lower, allowing the soul sphere resting upon it to be obtained. (sector 233)
 * 7) After descending either elevator in the stone area following the yellow key door, a portion of the northern wall is covered in muck.  Press on this wall and it will lower to reveal a combat armor. (sector 296)

Bugs
Due to secrets being impossible to reach, you can only obtain 85% Secrets on this level.

Routes and tricks
The switch that raises the staircase in the northeast of the map can be flipped early when the elevator around it is lowered, as long as you are facing the linedef the switch is on and within activation range. Walk against the east or west sides of the platform the switch is on, and face the linedef before triggering it.

Although the intended method to obtain secret #6 is to lower the platform it is on by pressing a hidden switch, you can also take the elevators to either side of it, and strafejump onto the platform from there.

The megaspheres in the room west of the red keycard are meant to be obtained in cooperative multiplayer gameplay only, but it is possible to acquire them in single-player. To do so, flip the two front switches, press one of the first inner switches, and then run to the second platform lowered on the other side. Wait for it to raise, and then walk onto the outer edge. From there, you can walk onto the platform the megasphere rests on and obtain it. You can do so for both sides. However, because it takes up more time than is needed to finish the level, this is only used in episode and full-game runs, where it is used to obtain one megasphere in preparation for the next level.

Current records
The Compet-N records for the map are: