Miasma

Miasma is a single-level PWAD for Doom II and a limit removing source port that was released in December 2016. It was created by Thomas Seifert (tourniquet) and uses the music track "The Mucus Flow" by B.P.R.D. Additionally, it includes "Press Fire" from ' for the title screen and "Save Room" from ' during intermission.

Miasma was awarded a Cacoward in 2016, and was featured in Doomworld's Top 100 Most Memorable Maps, placing 89th.

Secrets

 * 1) In the central section with the steps leading up to the rocket launcher trap, there will be a button on the northeast wall once you trigger the trap. Return to this section and shoot the button. Afterwards, if you head to the hallway surrounding this area and go counter-clockwise past the silver keycard. There will be a break in the hall where you can drop down and head north to get a box of ammo, a box of shotgun shells, a green armor (only on Ultra-Violence or higher), rockets, and the red skull key when you hit the switch. (sector 1634)
 * 2) In the westernmost cave with the plasma gun, the northernmost switch that appears while imps are teleporting in will lower the lift leading to the teleporter out of this area, but it will also reveal a skull switch a bit to the east. Go to this switch and use it before it closes to telefrag the cyberdemon as well as teleport to a soul sphere (only on Ultra-Violence or higher). (sector 1958)
 * 3) At the southeast end of the main map, lower the left on the west side of the bridge, but as it rises, get on the edge to the north. When you do this, hug the ledge as you go all the way to the east side. You will eventually find a button to press. Use this button, which will open a teleporter in the middle of the bridge, then go to that teleporter. You will teleport inside the building where the starting point is. Get to the main room of this building and get the computer area map to get the secret. (sector 4295)
 * 4) Get the red skull key in Secret #1, then go to the southernmost area. In the large compartment that holds the spider mastermind, go to the switch, but go to the right side of the switch to spot a button near its backside. Use that button, then quickly leave and enter the south compartment. Go through the southwest passage before it closes and press the skull switch. This is the room with one of the BFG9000s in the map. (sector 4457)
 * 5) As you approach the final tower in the map, move to the left as much as you can and jump to a brown floor just behind a rock wall with a single stalagmite. You will find a megaarmor in the slime to the southeast. (sector 4542)
 * 6) In the central section of the main map after getting the rocket launcher in the middle, you will end up in a trap room with several monsters and a switch to flip to the north. That switch will lower the walls around it, and just to the east will be a button. This will raise a small step leading to the outside area (as well as teleport in an arch-vile there). Climb up there and on the green floor towards another rocket launcher. Look north from there to spot another button on the far wall. Shoot it to reveal a soul sphere near the rocket launcher. (sector 4669)
 * 7) After getting Secret #3, the northern monster closet opens. Flip the switch there to open the southwest closet, then flip the brown switch there to lower the other switch, which is a lift with an arch-vile. Take the lift back to the teleporter, but go back down the hall leading to the main area instead. Another closet is open to the east, and in this closet, there will be a small switch on the south wall. Use this switch, then return to the main area of this building. Another arch-vile will be released, and in the alcove to the south will be an energy cell pack. (sector 4675)

Current records
The records for the map at the Doomed Speed Demos Archive are:

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