E1M9 (Return to Phobos)

E1M9 is a secret map in Return to Phobos. It was designed by Michael Kelsey.

The level can be accessed from E1M3 and will take the player to E1M4 after completing.

Secrets

 * 1) Going east from the red key you will reach a blue door leading to a corridor surrounding a room with a supercharge and several health bonuses.  This can be entered via a secret room accessible from the eastern corridor (the door is immediately opposite the differently-textured lift on the opposite wall). (sector 118)
 * 2) Take the aforementioned lift up to a room with a circular blood pool.  Drop down to the north, and take the nearby lift up to a small platform with two clips.  Go through the red door and round to another door at the end of the passage.  This takes you to a secret room. (sector 66)
 * 3) #2's eastern door opens on shooting, leading to a room with a stimpack, a box of bullets, a shotgun guy (medium and hard skills only) and an imp (hard skill only). (sector 68)
 * 4) The western wall at the southern end of #3 is a secret door leading to a ledge with a computer map. (sector 70)
 * 5) The exit room contains a switch that can be reached by jumping over the gap at either edge (doing so in the middle will exit the level).  Note that this ledge contains four health potions, but only three are visible and the fourth cannot be obtained.  The switch opens a room to the east of the start containing a plasma gun, some ammo, and (on multiplayer) a backpack.  The room can be reached by jumping into the gap at either edge and walking onto the teleporter, and teleporting again. (sector 172)

Bugs

 * The health bonus #109 can't be grabbed.

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

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