MAP01: I/O Error (Lilith)


lilith.pk3 maps 01-08

(01 - 08)
Bonus maps: 34 98 99

This level occupies the map slot MAP01. For other maps which occupy this slot, see Category:MAP01.
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MAP01: I/O Error is the first map of lilith.pk3. It was designed by anotak and uses the music track "D_RUNNNN" by Xaser Acheron. The par time defined in MAPINFO is 23 seconds.

This map is designed for the purpose of checking the engine (ZDoom is required to play all maps) and to warn the players.


Map of I/O Error
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.


The purpose of the map is to warn players about potentially epileptic effects. Also, like the other maps in the WAD, it checks whether the running engine is ZDoom. If not it will send you to MAP33 with a message suggesting you to use the proper source port. Otherwise, you stay on this map and can read a message left by its author:

Hi. Some people can experience seizures when exposed to flashing lights or other visual stimuli. Even if you've never been diagnosed, please be [sic] stop playing this wad if you encounter disorientation, lightheadedness, altered vision, involuntary twitching/jerking movements, or momentary loss of awareness/consciousness.
I tried very hard to avoid anything that would cause physical discomfort but everyone is different
If you understand this: walk through the wall and pull the switch.

Although the notification is somewhat exaggerated, it's ultimately up to the player to decide. The layout of the level is built of a plain rectangle with a square platform where you start standing and a slightly confusing ceiling under the platform and fake black walls around it.

The willing player only has to press the skull button ahead, turning a crushing ceiling on. This will hurt you, but you warp to Level 2 with fully recovered health.

Other points of interest[edit]


There are no official secrets in this level.


Demo files[edit]

Areas / screenshots[edit]


As this level does not contain official secrets, the NM 100S category is redundant.

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
UV max
UV -fast
UV -respawn
UV Tyson
UV pacifist
NoMo 00:02 Daniel, the NCR Veteran 2021-11-10

The data was last verified in its entirety on September 30, 2022.


Map data[edit]

Things 8
Vertices 17
Linedefs 17
Sidedefs 23
Sectors 4


This level contains no things apart from the player starts.

Technical information[edit]

Inspiration and development[edit]


See also[edit]


External links[edit]