MAP10: Eureka Signs (BTSX-E2)


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Secret map: 31

This level occupies the map slot MAP10. For other maps which occupy this slot, see Category:MAP10.

MAP10: Eureka Signs is the tenth map of the second episode of Back to Saturn X. It was designed by Sarah Mancuso (esselfortium), who also composed the music track, "Noir." In the official add-on version, this level's name is Tarantula Oil.


Map of Eureka Signs
Letters in italics refer to marked spots on the map. Sector, thing, and linedef numbers in boldface are secrets which count toward the end-of-level tally.


Head straight forward past some shotgun guys and zombiemen to a curved staircase - noting three revenants that teleport behind you - then go down to a water pool and kill (depending on skill level) imps, demons or revenants that are released to your right. Head up the stairs on the north side to find an arch-vile guarding an armor and a crucifix button, push it then head south down some more steps to a barrier that has lowered to reveal a long walkway. Go through either of the doorways to your right and climb some steps to a junction with imps, zombiemen and an arachnotron, then go through either of the north archways before turning right to enter a narrow hallway with a cacodemon. Follow the hallway until it turns left - which will trigger an ambush by zombies, revenants and a pain elemental - then continue following the hallway until you can run across a gap to reach the blue skull key. Watch out for mancubi and cacodemons teleporting in to block your escape routes.

Drop into the water below and head north to a curved staircase, climb past some zombiemen and imps to a room with a mancubus, then go through the south doorway to see a blue key door on your left. Open the door and press the crucifix button ahead to lower a barrier on the other side of the pool, then step past that barrier to kill zombies, an arachnotron and one or two arch-viles blocking your path to some blue bars; the bars will lower when you approach them, allowing you to return to the starting point. Head back to the long walkway, passing two more arachnotrons and a mancubus, then open the blue key door at the west end and kill another arachnotron standing at the top of a staircase. Go down the steps and run across two gaps to reach a rocket launcher and supercharge, head straight forward to go outside and confront some waiting revenants and chaingunners then follow the path until you see a revenant (or arch-vile on Hurt Me Plenty (HMP) or higher) teleport to your right; demons, chaingunners and shotgun guys will be released behind you at the same time.

Continue following the path north to a curving staircase, then follow it past a few enemies until you reach a crucifix button at the top - this will raise a bridge from the water below. Head back downstairs and cross the bridge, then step around the red mural in front of you to find the red skull key being guarded by two arch-viles (one may teleport behind you) and other enemies. Head up the steps at the back of the room to a red key door and open it, which will put you back at the blue key door you used earlier, then pass through a second red key door in front of you and climb the steps to a grassy area with a few shotgun guys. Head straight forward to some green torches and turn left, kill some imps and revenants that are released behind you then carefully head down the curved steps (killing two chaingunners and a cacodemon/pain elemental inside the center column) until you can leap to a platform with red torches. In the next room, head round to the north side of the lava pit and kill a Hell knight along with some zombiemen, then go down the steps to a radiation shielding suit and take it before dropping into the lava pool ahead. Kill an arachnotron (or arch-vile on HMP or higher) that is released to your right then run east to the yellow skull key.

Activate the lift behind the yellow key to reveal an arachnotron, slay it then step through to a second lift that leads back up to the empty room at the north end of the map. Head due south, past the smaller blue key door you used earlier, until you drop to the floor below then turn right to see a yellow key door; open this door along with a second door in front of you and kill any demons, imps or revenants waiting behind it, then follow the tunnel to a junction with more imps as well as chaingunners. Go down the right-hand staircase and pass through a doorway on your right, then head down some more steps to a hexagonal hallway with a cacodemon - as you approach the next door it will close and imps, shotgun guys and revenants will be released around you. Enter the neighboring chamber to find a crucifix button that will re-open the door, head through it then run south until you turn a corner and confront some spectres and imps; slay them quickly as a group of cacodemons will also be released behind you. Pass through the doorway behind the spectres to find revenants and chaingunners guarding another crucifix button, press it then drop into the water and head north into a room containing zombiemen; as you enter the room two arch-viles will be released ahead, and a platform with a mancubus will lower behind you.

Go to the platform with the mancubus and enter the tunnel behind it, which leads to a cavern with three gray pillars and a crusher, then look in the south-east corner for a crucifix button that will lower the first pillar; make sure to dispose of the cacodemons overhead before you continue. When you step on the first pillar it will rise towards the ceiling along with the third pillar, but when you step on the second pillar the third will start to lower again; you need to time your jumps so that you reach the third pillar, then leap past the crusher to a ledge on the north side of the cavern. Enter the next room and climb the steps, noting some imps/revenants that are released behind you, then turn right at the top and follow the path to a diamond button that will raise a bridge behind you. Cross the bridge and enter the trench just ahead, then go forward to some shotgun shells - the wall ahead will lower to reveal zombiemen (and an arch-vile on HMP or higher), as well as a mancubus to your right. Look inside the mancubus's compartment for a diamond button that will lower another wall at the end of the tunnel, revealing the exit portal.

Other points of interest[edit]


  1. From the very start, turn left and open the wooden bit of wall (behind the sets of shotgun shells) to find a berserk pack. (sector 573)
  2. In the large room with the multiple skulls on poles at the very north of the map, check the south-east corner for a diamond button. This button opens a passage at the north end of the room (sector 285) leading to a supercharge.
  3. At the veranda leading to the blue key, there are four niches on the south-east corner. One of them has a different wall texture; press it to open a small room (sector 566) in a monster closet to the west of the niches, with a medikit and two energy cells.
  4. After the ambush at the very south, check the compartment the enemies come from. One nook has an orange wall light, the other has a blinking yellow rune. Use this rune to lower a lift to the left, leading to an elevated balcony (sector 521) where you can collect a few armor bonuses and a supercharge.
  5. At the south-west end of the map, there is a crucifix switch below three torches, and a lone bookcase to the south of it on a platform with candles. On a corner in the stairway to the south-east there are three figures. Use the one with the glowing eyes, then immediately run to the platform, drop down to the right and hit the switch on the pillar to lower the bookcase's platform like a lift. If you did this sequence fast enough, the bookcase will sink into the platform enough for you to hop into the secret passage behind it (sector 1048) as the whole platform raises back up. Head through this passage and across the stone walkway to the water on the other side, where a wall has lowered to reveal a secret chamber containing four energy cell packs and a megasphere.


Demo files[edit]

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Current records[edit]

The records for the map at the Doom Speed Demo Archive are:

Run Time Player Date File Notes
UV speed
NM speed
UV max
NM 100S
UV -fast
UV -respawn
UV Tyson
UV pacifist

The (absence of) data was last verified in its entirety on February 21, 2022.


Map data[edit]

Things 1287
Vertices 7407*
Linedefs 8150
Sidedefs 11312
Sectors 1082
* The vertex count without the effect of node building is 6560.


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

Technical information[edit]

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