List of levels with completion issues

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The following table lists levels where full completion is prevented for any reason when the player follows normal gameplay. It is intended to serve as a reference index for map authors that wish to avoid the listed pitfalls, as an aide for players that wish to know when a level has issues, and as an overview for investigators that want to apply their knowledge to develop new workarounds.

A level is considered fully completed when the following four statements are true:

• Kills: All monsters that count towards the kills percentage (except those spawned by the Icon of Sin) are dead.
• Items: All items that contribute to the items percentage are collected.
• Secrets: All secrets must be registered as visited.
• The exit can be reached.

Whether or not the player follows normal gameplay when being prevented from a full completion depends on the context of the player and level, and can not be rigidly defined. A rough guideline for level inclusion that supports the purpose of the article is as follows:

• A level where some category of completion appears to be impossible and has no known workaround must always be included; context is irrelevant as this is a clear completion prevention.
• Similarly, a level where an unknown trick is intended for full completion should be included, as no known strategy or workaround exists.
• Conversely, a level where a known trick is intended for full completion should not be included, as this is normal gameplay for that level that can be discovered via a walkthrough.
• A level where full completion appears unintended or otherwise impossible to the intended player audience, where a trick exists for full completion, should usually be included, depending on how trivial the trick is. An extremely trivial workaround such as the item completion in MAP31 of Perdition's Gate is fair to leave out as it merely involves touching a wall, while workarounds involving engine bugs should usually be included.

Completion category key

Each level has kills, items and secrets (K, I, S, respectively) categories that may have problems.

	There are no significant problems in this category.
N	No workaround is known to exist.
D	There is a demo-compatible workaround for this problem (such as by using a rocket jump).
ND	There is a non-demo-compatible workaround for this problem without the use of cheats (such as by saving and reloading the game).

Cause key

Some causes are common and are listed here. Uncommon causes may be left blank or not listed here, suggesting a visit to the level's page for further information.

CL	Author comments regarding compatibility level or intended source port contradict the level design, making for ambiguity on how to play the level correctly. Subcategory keys: POL, Use
Closet	A monster closet malfunctions and fails to open.
CM	There is more than one computer area map in singleplayer. In vanilla Doom, a player can only take one per level, but both count as items.
Co-op	The K/I/S is in a co-op-only area but appears outside of co-op.
Deleted	A secret sector gets deleted after the level has already loaded, but is still required for full completion. This can sometimes be worked around by just being quick.
DM	The K/I/S is in a deathmatch-only area but appears outside of deathmatch.
Extreme	A player can not be reasonably expected to fully complete the level due to overwhelming odds, though it is technically possible. TAS may be required.
MX	The level forks into separate paths of no return, and some K/I/S are mutually exclusive.
NoMo	A monster required to progress or obtain something is not present in no monsters mode, making full completion impossible. Levels with monster-powered completion devices rarely have fail-safes for this. Subcategory of the X key.
OOB	The K/I/S is placed out of normally playable bounds, e.g. in the void, a ledge too high to reach, or in an unreachable room.
POL	A teleport (such as in a teleporter trap) failed because of a source port's different point-on-line algorithm. Affected source ports include Zandronum, ZDoom and GZDoom, though only Zandronum lacks the ability to configure it. Subcategory of CL.
Snap	An item is unreachable due to the thing snapping up to ledges bug, either because the bug puts the item out of reach, or because the bug is deliberately used to put the item in reach but is disabled in certain ports.
Thin	The secret sector is too thin to stand on. To register a secret sector as having been visited, a player must stand on it with their center point. The workaround is often to use the flicker glitch or a squeeze glide.
Trap	A teleporter trap malfunctions and fails to teleport something.
Trickle	A room with monsters that is difficult for them to leave requires excessive amounts of manipulation from the player moving around the level to herd them towards the room's exit.
Use	The level has use-blocking linedefs placed in front of important objects, preventing their use. Some source ports allow use attempts to pass through such linedefs by default (like GZDoom) or by option (like Boom). Subcategory of CL.
Unused	A secret sector exists in map data but is not placed anywhere in the level. The game counts it regardless, making for an unreachable secret.
X	Something important is exclusive to certain skill levels or modes, such as an important key only appearing in multiplayer mode. When only no monsters mode is affected, use the "NoMo" key.

WAD	Map	K	I	S	Cause	Notes
1 Monster	MAP03: Sergeant Center	D			Trap	Patch exists.
1 Monster	MAP23: Musical Bar-B-Que	N	N		Trap	Patch exists. UV max 28/45 kills, 107/112 items.
100 Line Christmas	MAP25: Satan Claus	N			OOB	Unreachable arch-viles.
100 Lines (Traditional)	MAP05: Convenient System Store			N	Thin
10 Line Genocide: Episode 1	MAP23: A Feast For Hell Knights	D			Ammo	Doable with items from previous levels.
10 Line Genocide: Episode 3	MAP17: B-Quiet			N	OOB
10 Line Genocide: Episode 4	MAP01: They Are Watching! Run	D			Extreme	Imps can be punched, but it may be TAS-only.
10 Line Genocide: Episode 4	MAP04: Rear Hatch Escape	D			Extreme
10 Line Genocide: Episode 4	MAP16: 10 Lines, I Guess	D			Extreme	TAS required.
10 Line Genocide: Episode 4	MAP41: Claustroviolence				Extreme	TAS-only, or otherwise no completion recording is known to exist.
10 Line Genocide: Episode 4	MAP46: The Elder Scrolls	N			Ammo
10 Line Genocide: Episode 5	MAP09: C Baron	D			Extreme	Requires non-berserk punching 27 barons in a small space, may be TAS-only.
10 Line Genocide: Episode 5	MAP12: Decimal 4	N			OOB	Unreachable arch-viles.
10 Line Genocide: Episode 5	MAP31: Jocket Rump		N		CM
10 Line Genocide: Episode 5	MAP33: 2023 Nuts		N		OOB	Soul sphere things 20206–20209 are placed in void outside the level.
10 Line Genocide: Episode 5	MAP34: We Don't Need Physics To Where We're Going	N				Over 1000 cyberdemons and no items. The blockmap does not work, so no attacks can land anyway.
10 Line Genocide: Episode 5	MAP37: Light Pillar In Abyss		N		OOB	Invulnerability stuck in exit compartment, which cannot be opened because the keys are outside the blockmap. Requires zero press to exit.
10 Line Genocide: Episode 5	MAP39: Bloody Revenants	D	D		Extreme	May require TAS.
10 Line Genocide: Episode 5	MAP43: The Worst Void Possible	N				Free void with over 1000 arch-viles, it is unclear if they can be harmed.
10 Line Genocide: Episode 5	MAP46: Miniddo				Extreme	Excessive luck required for a continuous attempt at completion. TAS exists.
1994 Tune-up Community Project	MAP15: Cratebase	N			POL	UV/NM co-op affected.
1994 Tune-up Community Project	MAP16: Infinity Plus			N	OOB
1994 Tune-up Community Project	MAP22: Retour en le Nefarious Chateau	N			Trap
1994 Tune-up Community Project	MAP30: Pure Evil		D		X
2002 A Doom Odyssey	E3M3: Stronghold of Damnation	D			Extreme
2002 A Doom Odyssey	E4M3: Hell Unleashed			N	OOB
2002 A Doom Odyssey	E4M4: Disreputable Stronghold	N			Trap
2048 Unleashed	MAP17: Grim Keep	D	D	D	Use
2048 Unleashed	MAP25: Acid Reflux	N	D	D	Use
3 heures d'agonie	MAP28: Impulsion		N		Snap
5 Minute Map Collection	MAP26: The Red X of DOOM	N			Extreme	Impossible with pistol start; four distant cyberdemons, a time limit, and no ammo. Items from a previous level might make it technically possible.
5 Minute Map Collection	MAP28	D			OOB	The arch-vile placed in void can be killed with plasma which clips slightly through walls before exploding.
5 Minute Mayhem	MAP20	D			Extreme	Technically possible; four punchable cyberdemons, no weapons.
5 Minute Mayhem	MAP29	D			Extreme	Constant cyberdemon luck required.
99 Ways to Die	MAP03	N		N	Thin, X	Cannot reach exit room on UV/NM due to broken teleport.
Alien Vendetta	MAP25: Demonic Hordes		N		Co-op
Alien Vendetta	MAP28: Whispering Shadows		N		Snap	Boom affected.
Aliens TC	E2M3: Med-Labs and Operations	D			Extreme
Aliens TC	E2M4: Med-Labs and Operations	D			CL	Requires Boom to play properly.
Aliens TC	E2M5: Atmospheric Processor			N	Unused
Aliens TC	E2M9: Alien Host Ship	N			CL	Requires Boom to play properly.
Ancient Aliens	MAP23: Trinary Temple	N			POL
Ancient Aliens	MAP24: Culture Shock		N		OOB
ASDoom	E1M4	D			Trickle
ASDoom	E1M9	D		D	MX
Arrival	MAP09: The Writhing Altar		N		OOB
Arrival	MAP32: Dad Bod	N			CL	Original version requires Boom to play properly.
Back to Saturn X: Episode 2	MAP06: Useless Inventions	N			POL
Back to Saturn X: Episode 2	MAP19: Unbaited Vicar of Scorched Earth	N			Trap
Base Ganymede	E1M1	N			Trap	ITYTD/HNTR/HMP affected
Base Ganymede	E3M4	N			Trap, X	On HMP or lower a baron is unable to teleport to the playable area. On ITYTD/HNTR the player can be softlocked if they do not get the blue key last, due to a missing teleporter destination.
Chex Quest	E1M3: Experimental Lab	D	N		OOB, CM	OOB monster killable with weapon/monster projectiles.
Community Chest	MAP20: Technodrome			N	NoMo
Community Chest	MAP21: Avenger			N	Thin
Community Chest	MAP31: Mt. Chaos			N	NoMo
Community Chest 2	MAP06: The View			N	CL	Relies on ZDoom untagged shoot-switch behaviour.
Community Chest 2	MAP18: Internal Reaches 3				NoMo
Community Chest 2	MAP20: Enigma			N	CL	Relies on outdated ZDoom behaviour.
Community Chest 2	MAP24: The Mucus Flow	D	D	N	Use, OOB
Community Chest 2	MAP26: Geist Halls			N	NoMo
Community Chest 2	MAP28: No Room			D	OOB
Community Chest 3	MAP07: Simple Complex				NoMo
Community Chest 3	MAP12: Black Rain	N			Trap
Community Chest 3	MAP31: Disarming the Mechanism		N		OOB
Cyberdreams	MAP24: Sorry, 66% Maximum	D			Extreme	The map features three cyberdemons, but one must be left alive to shoot at a Romero's head to finish the level.
Dante's Gate				D	Thin
Dark Hell	E2M1: Dark Dome Stairs			N	Thin	Old version affected.
Dark Hell	E2M6: BEWARE			N	Thin	New version affected.
Dark Hell	E2M7: Ankh Cliffs		N		CM
Dark Hell	E2M8: Tower of Demons		N	N	Thin, OOB
DBP37: AUGER;ZENITH	MAP10: Photon Geyser	N			POL
Demonfear	MAP05: Communication Base	D			Trickle
Demonfear	MAP27: Hell's Paradigm			D	Thin	Solved via squeeze glide.
Doom	E1M6: Central Processing	D			OOB	Old version affected.
Doom	E1M8: Phobos Anomaly	D			Extreme
Doom	E4M3: Sever the Wicked			N	OOB
Doom	E4M7: And Hell Followed			ND	Thin, OOB	Two affected sectors, one can be reached via a cyberdemon-assisted rocket jump.
Doom II	MAP15: Industrial Zone			D	Thin
Doom II	MAP27: Monster Condo		N	D	CM, OOB
Doom the Way id Did	E3M4: Torture Chambers	D			Closet	ITYTD/HNTR affected.
Down the Drain	MAP06: Baloney Town		D		OOB
Down the Drain	MAP10: Here n There, Now n Then			N	Thin
Eternal Doom	MAP03: Inter-Base			N	OOB
Eternal Doom	MAP05: Time Gate	N			MX
Eternal Doom	MAP10: Crimson Tide		N		OOB
Eternal Doom	MAP12: Darkdome	D			OOB
Eviternity II	MAP36: Kenosis	N			Trap	GZDoom on Annihilate Me skill affected
Fava Beans	E1M4: Triton Lunar Base			D	Thin
Final Fantasy Doom	E1M8: Castle Keep		N		CM	Max 1/2 (50%).
Final Fantasy Doom	E2M1: Crystal Cavern		N		OOB	Max 0/1 (0%).
Final Fantasy Doom	E2M5: Narshe		N		OOB	Max 26/27 (96%).
Final Fantasy Doom	E3M6: Research Facility	N			Ammo	Low ammo, unreachable cyberdemons. Max 5/10 (50%) with (TAS-only) melee, otherwise 2/10 (20%).
Hacx	MAP07: The Great Wall	N			OOB
Hacx	MAP17: River of Blood	N			OOB
Harmony	MAP05: The Hospital		N		OOB	Original version affected.
Harmony	MAP08: Airstrip One	D			OOB
Hell Revealed	MAP23: Ascending to the Stars		N		CM
Hell Revealed	MAP26: Afterlife	N			OOB	424/428 possible.
Hell Revealed	MAP32: Mostly Harmful	D			OOB	287/327 possible without the trick.
Hell Revealed II	MAP12: Anti Static	N			Trap
Icarus: Alien Vanguard	MAP13: Asylum			N	Thin
Icarus: Alien Vanguard	MAP15: Waste Disposal			D	OOB
Icarus: Alien Vanguard	MAP29: Brutality		N		OOB
Italo-Doom	MAP07: Central Processing		N		OOB
Junkfood 4: Slotterween	MAP37: Croquette Corp	N	N		Closet, OOB	Max 4175/4176 (99%) kills (thing 459), 24269/24361 (99%) items (item column at thing 8890).
Legacy of Rust	MAP03: Spirit Drains	N			Trap	Old version affected.
Legacy of Rust	MAP07: Forfeited Salvation	D			Extreme
Master Levels for Doom II	MAP07: Bloodsea Keep	N			X	NoMo/ITYTD/HNTR affected.
Master Levels for Doom II	MAP07: Mephisto's Maosoleum	D			OOB
Master Levels for Doom II	MAP07: Nessus			ND	Thin
Master Levels for Doom II	MAP25: Black Tower	D			Trickle
Memento Mori	MAP11: Halls of Insanity	N			Co-op
Memento Mori	MAP15: Karmacoma			D	OOB
Memento Mori	MAP17: House of Thorn			N	Thin
Memento Mori	MAP18: A Dead Man's Town	N			Closet
Memento Mori	MAP20: Mountain Depot	D	D		OOB
Memento Mori	MAP27: Fort Hades			N	DM
Memento Mori II	MAP01: Outpost		N		DM
Memento Mori II	MAP03: ...And Hell Beneath		N		DM
Memento Mori II	MAP11: Sewer Shutdown		N		DM
Memento Mori II	MAP14: A Question of Time		N		DM
Memento Mori II	MAP16: The Nephilim		N		DM
Memento Mori II	MAP18: Regulate	D	N		OOB, DM
Memento Mori II	MAP22: R.R.F. Refinary		N		DM
Memento Mori II	MAP23: No Way Out		N		DM
Memento Mori II	MAP25: Forgotten Town	N			OOB
Memento Mori II	MAP26: Base Exposure			N	Unused
Memento Mori II	MAP27: The Silos		N	N	Thin, OOB
Memento Mori II	MAP28: Corporate Hell		N		DM
Memento Mori II	MAP30: It		N		Co-op
Memento Mori II	MAP31: DejaVu	N			Trap
Memento Mori II	MAP32: Dances with Demons	N			Trap
Memento Mori II	MAP01: Secret Operation 1	N			Trap
nocheat	E2M1	D			Extreme	Two cyberdemons requiring non-berserk punching; TAS demo exists.
NoYe	MAP03: A Snaking Suspicion	N			OOB	Inaccessible cyberdemons and not enough weapons.
NoYe	MAP04: Midnight Meeting	D			Extreme	Three cyberdemons and a bit of ammo, some non-berserk punching required.
NoYe	MAP21: A Reach Beyond Reaching	N			OOB	Inaccessible cyberdemon and no weapons.
NoYe	MAP27: AV Pachinko		N		OOB	Visible items inaccessible.
NoYe	MAP30: Going Up?			D	Extreme	Features an infinite secret generator. It takes over 27 years of waiting to get max secrets.
NoYe	MAP32: Thissuxx Memeorial		N	N	OOB	Secret and northwest invulnerability inaccessible.
NoYe	MAP35: Revball		N		OOB	Invulnerability inaccessible.
Obituary	MAP14: Halls of the Requiem	D			Trickle
Obituary	MAP15: Castle of Damnation	D			Trickle
Perdition's Gate	MAP03: UAC Executive Areas, Recreation Area/Yard			D	Thin
Perdition's Gate	MAP12: Entryway to the Worlds of the Ancients			N	Thin
Perdition's Gate	MAP27: Hell's Masterpiece			N	Thin
Perdition's Gate	MAP29: The Bomb Facility	D			OOB
Perdition's Gate	MAP31: World of Wonders: The Planet of Living Rock		D		OOB
Plutonia 2	MAP03: Skull Island		D		OOB
Plutonia 2	MAP06: Collider Complex		D		OOB
Plutonia 2	MAP11: Arch-Violence	D			Extreme
Plutonia 2	MAP20: Lurking Fear	N			Trap
Plutonia 2	MAP27: Red Hot	N			Trap
Plutonia 2	MAP32: Go 4 It	N			Trap
Requiem	MAP03: Poison Processing	N			Trap	UV/NM co-op affected.
Requiem	MAP04: Fireworks		N		DM
Requiem	MAP06: nataS ot etubirT		N		DM
Requiem	MAP08: The Reactor		N		DM
Requiem	MAP09: Deep Down Below		N		DM
Requiem	MAP12: Militant Reprisal		N	N	OOB
Requiem	MAP21: Den of the Skull	D	D	N	Thin
Requiem	MAP23: Hatred	D		N	OOB
Requiem	MAP29: Downer			D	Deleted
Revolution!	MAP01: Carnivorous Cargo			N	OOB
Revolution!	MAP05: R 'n R			N	Unused
Revolution!	MAP20: X Marx the Spot			N	Unused
Sacrament	MAP04: Phobia	D	D		MX
Sacrament	MAP08: Zone X		N	N	CL	Requires Boom to play properly.
Sacrament	MAP10: Wood Prison	N	N	N	CL, OOB	Requires Boom to play properly.
Scientist 2	MAP09: Bio Lab			N	OOB	The same map with this issue is also in Scientist.
Scientist 2	MAP17: Second Horseman		D		OOB
Scientist 2023	MAP17: Alchemical Warfare		D		OOB
Scythe	MAP27: Terror		D		OOB
Scythe	MAP28: Run From It	D			Extreme	100% kills is technically possible while sliding dead towards the exit.
Speed of Doom	MAP14: Sledge		D		MX	Requires arch-vile jump.
Sunlust	MAP02: Down Through	N			Trap, closet	ITYTD/HNTR affected, GZDoom UV/NM affected
Sunlust	MAP04: Sol		D		OOB
Sunlust	MAP27: Emerald Spire		D		OOB
The Apocalypse Project	E1M4		D		OOB	Requires items brought from a previous map.
The Apocalypse Project	E1M6		D		CM
The Plutonia Experiment	MAP11: Hunted	D			Extreme
The Plutonia Experiment	MAP26: Bunker			D	Thin
The Plutonia Experiment	MAP27: Anti-Christ	D			OOB
TNT: Evilution	MAP15: Dead Zone	D			OOB
TNT: Evilution	MAP31: Pharaoh	N			OOB, X	Original version affected and unplayable in singleplayer without exploits.
Ultimate Doom In Name Only	E4M8: Unto the Cruel		N		MX
Vae Victus	MAP02	N			CL	Works in ZDoom, teleporter trap broken in other limit-removing ports.
Vae Victus	MAP03			N	CL, OOB	Playable in ZDoom where use passes through triggers, unplayable in other limit-removing settings.
Vae Victus	MAP04				CL	Works in ZDoom where use passes through triggers, unplayable (or barely playable) in other limit-removing settings.
Vae Victus	MAP05	N			CL	Works in ZDoom where vertical aim is enabled, kills out of reach in other limit-removing settings.
Zombies TC	MAP02: Copkiller	N			Trap	Sector with thing 182 affected.
Zombies TC	MAP03: Refuel the heli	N			OOB, DM	Southeasternmost zombie on a hill cannot be hit by autoaim, but can be killed by spread when shooting other zombies. Two zombies (things 284, 375) in deathmatch-only room.
Zombies TC	MAP05: Close the doors			N	OOB	Unreachable sectors next to actual secret are also secret by accident.
Zombies TC	MAP08: Big city nights	D				Teleporter trap monsters behind illusory walls do not wake up unless shot.
Zombies TC	MAP10: Oil refinery	N		N	OOB, unused	Five monsters placed in void.