E1M4 (Return to Phobos)

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Return to Phobos maps
This level occupies the map slot E1M4. For other maps which occupy this slot, see Category:E1M4.

E1M4 is the fourth map of Return to Phobos. It was designed by Michael Kelsey.


Map of E1M4
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.


Other points of interest[edit]


  1. From the blue key (which is located in the north-east in the area with various paths inside columns over a blood floor), jump south, east, south, east, north then turn and jump east then north to a platform containing a supercharge and an imp (two imps on hard skill). (sector 114)
  2. Just south-east of the exit is a long east-west room with a megaarmor at its east end. The eastern wall here is a secret door leading to a room with a chainsaw and (in multiplayer only) four rockets. (sector 46)
  3. The very north-west area of the map (with the nukage pit containing a supercharge and other health and armor items) contains a secret door on its south wall leading to a room with a teleporter to a room with a supercharge (which can be lowered using a switch). Both of these rooms count as secrets. The trigger line for the door to the former is the step leading to two health bonuses in the west of the north-west area – however, this step is too high to cross, so only 50% secrets and only 88% items are obtainable. (sector 89)
  4. See #3. (sector 85)


  • The map has red doors but no red key. The map can still be completed, however.
  • The map has a yellow key but no yellow door. Linedef 642 is surrounded by trim colored for a yellow door, but it a regular door, and will open without any key.
  • Some secrets cannot be reached (see above).

Demo files[edit]

Areas / screenshots[edit]


Routes and tricks[edit]

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 0:13.77 Napsalm 2023-10-20 return0114n1377.zip
UV max
NM 100S
UV -fast 9:51.97 Serge Marudov (Never_Again) 2002-05-27 return01_na.zip
UV -respawn
UV Tyson
UV pacifist

The data was last verified in its entirety on November 2, 2023.


Player spawns[edit]

This level contains seven spawn points:

  1. facing west. (thing 224)
  2. facing north. (thing 225)
  3. facing west. (thing 227)
  4. facing south-west. (thing 228)
  5. facing south-west. (thing 237)
  6. facing west. (thing 417)
  7. facing west. (thing 523)


Map data[edit]

Things 527
Vertices 1647*
Linedefs 1738
Sidedefs 2460
Sectors 148
* The vertex count without the effect of node building is 1486.


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

Technical information[edit]

Inspiration and development[edit]


External links[edit]