Odessa 9

ODESSA 9 ("Landing Zone") is a single-level PWAD for Doom II. It was designed by Bob Evans as part of his Odessa series.

Secrets

 * 1) North of the blue switch is a series of crates. It is possible to jump across them from the west into the easternmost one, which contains a chainsaw and a switch. The switch lowers the sides of the crate, revealing another switch which lowers most of the western large crate, revealing a path to a box of bullets and a staircase with several monsters, at the top of which are a box of shotgun shells and a teleporter back to normal territory. (sector 82)
 * 2) In the south-west corner of the lift by the blue switch is a gap leading to a room with a baron of Hell, an energy cell, 4 shotgun shells, and two medikits. There is also a soul sphere to the west – getting it reveals a room with several monsters and a plasma rifle on a lowering lift, beyond which is a path back to normal territory. (sector 14)
 * 3) The door to the south of the red key (in hard skill) leads to a path with a switch on its northern wall. This switch lowers a lift on the northern side of the red key room, leading to an area with a demon, an armor, two armor bonuses, and two medikits. On easy and medium skills there is also a box of shotgun shells, a box of bullets, and the red key. (sector 142)
 * 4) Immediately to the west of the switch which opens up the exit is a secret door (marked with a different texture) ultimately leading to a room with nine alcoves on its west side and a branch to the east (containing a berserk and a medikit). There is a switch in the east of this branch – it opens up a door in the southernmost of the nine alcoves leading to a room with a berserk, some ammo, and a yellow key. The switch here lowers a BFG9000 further north, near to which (on the top step) is a yellow switch which re-opens the bars which closed earlier. (sector 219)

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

Player spawns
This level contains four spawn points:
 * 1) facing south-west. (thing 266)
 * 2) facing south. (thing 267)
 * 3) facing north. (thing 269)
 * 4) facing south-west. (thing 272)

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