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Eyeaduct 1.png
Basic information
Map type King of the Hill
File name: koth_viaduct_event
Developer(s): Valve
Map Info
Environment: Halloween
Setting: Nighttime, overcast
Hazards: Pumpkin bombs,
Water in the Underworld,
Underworld damage-over-time effect,
Loot Island explosion
Map Items
Healthico.png Health Kits: Healthpie.png ×6
Ammoico.png Ammo Boxes: Mediumammo.png ×6
TF2 crosshair.png Special: HauntedHalloweenGift.png   •   Pumpkin.png
Map Photos
Menu photos koth viaduct event.png
Viaduct has been haunted and is now... Eyeaduct!
Eyeaduct has multiple variations, including King of the Hill.

Eyeaduct is an official King of the Hill map, released as part of the Very Scary Halloween Special on October 27, 2011. It is the Halloween version of Viaduct. Similar to Ghost Fort and Mann Manor, Eyeduct has spawning prizes, pumpkin bombs, and a boss.


Overview of the map, with gifts. (Large file)
Overview of the underworld, with gifts. (Large file)

Similar to the previous year's Halloween event map, Mann Manor, Eyeaduct has spawning prizes, pumpkin bombs, and a boss. It also includes the haunting ghosts of 2009's Halloween event map, Harvest Event. The ghosts will not appear until the point has been captured by one of the teams. The boss will appear once 10 people are playing.

MONOCULUS haunts this map much the same way that Horseless Headless Horsemann haunts Mann Manor; he will spawn on the Control point, roam the map, and attack players and buildings of either team. He may arrive at any phase after "waiting for players" mode, including before the activation of the control point and during humiliation.


Eyeaduct features an Underworld section, which is usually only reachable through portals that are created when MONOCULUS teleports or is killed. When MONOCULUS teleports, he leaves behind a purple portal, which has considerable attractive force and remains active for a few seconds. If players get close enough to the portal before it closes, they are restored to full health and transported to one end of a chain of small islands in the Underworld. Players on the islands suffer a health drain similar to bleeding, which continues as long as they remain there, and increases in damage with time. Teleporters and other buildings cannot be placed in the Underworld.

At the far end of the islands is a glowing white portal back into the map. Players must jump, be knocked back, or be airblasted by an enemy to reach the portal, as the falling into the waters of the Underworld will cause the player to die. Stepping into the white portal instantly teleports the player back into the main map, and grants invulnerability, a 200% overheal, a speed boost, and a crit boost for a limited time.

Loot Island

When MONOCULUS is killed, he leaves behind a floating Bombinomicon. Players who enter the Bombinomicon are teleported to Loot Island, another section of the Underworld just beyond the regular island, with a small hill leading to a large skull-shaped formation. The normal Underworld health drain is not in effect on Loot Island. Upon entering the formation, players await a cage to descend, allowing them to jump into the Bombinomicon. If a player enters the Bombinomicon, they are teleported back to the map, granted the achievement Dive Into A Good Book, given the Bombinomicon item (if neither have been earned yet), and buffed identically to exiting the Underworld through the white portal. Those who stay behind for too long are engulfed in an explosion that will instantly kill anyone caught in it.

Halloween Gift

The Haunted Halloween Gift will spawn at random locations around the map at 5 minute intervals if at least 10 players are connected to the server and the server is registered. These behave similarly to the gifts in Mann Manor, except the player who finds it will receive a random Halloween costume piece on death instead of a Halloween Mask. Those who pick up a Haunted Halloween Gift in the Underworld will get a Haunted version of the item. Only the player for which the gift has spawned will see the spawn and obtain notifications. Several notifications will appear until the player grabs the gift or it disappears.


At the start of humiliation, all surviving players not in the Underworld are transported to the same Underworld islands which are reached through purple MONOCULUS portals during normal play. However, some players may materialize near to the white portal rather than in the usual starting location. Members of the losing team can take the white portal back to the main map, but receive no invulnerability or crit boost when they do; the white portal works as usual for the winning team.


Main article: Community Eyeaduct strategy

Control Point timing

Control Point Multiplier Seconds
Control Point ×1
12 .000
8 .000
6 .545
5 .760

Related achievements

See also: Obtaining Halloween achievements

Pumpkin.png Scarechievements

Attack o' Lantern
Attack o' Lantern
Cause the deaths of 5 players by exploding nearby pumpkin bombs.

Scared Stiff
Scared Stiff
Kill a player scared by a ghost.
Candy Coroner
Candy Coroner
Collect 20 Halloween pumpkins from dead players to unlock a hat.

Ghostchievements icon.png Ghostchievements

Masked Mann
Masked Mann
Collect a Soul Gargoyle in Mann Manor.

Monoculus angry.png Eye-chievements

Dive Into A Good Book
Dive Into A Good Book
Get to Loot Island and claim your reward!
Optical Defusion
Optical Defusion

Update history

October 27, 2011 Patch (Very Scary Halloween Special)

  • Added Eyeaduct to the game.

November 3, 2015 Patch

  • Updated the Monoculus battle on Eyeaduct to call a temporary truce between the teams while fighting the boss.


  • The Bombinomicon on Loot Island, when observed from behind, has a price tag attached to it on the bottom that reads, "$6.66". It also has a full written summary of the Bombinomicon and quotes from critics at the bottom.
  • The inside of the Bombonomicon contains the Anatomy of a Demoman, similar to Leonardo Da Vinci's Vitruvian Man, and several pictures of rocks.
  • A page in the Bombinomicon shows two chemical diagrams. The chemicals shown in the the book are trinitrotoluene (C6H2(NO2)3CH3) and nitroglycerin (C3N3H5O9). Trinitrotoluene is an explosive material, also known as TNT, and commonly used in making bombs. Nitroglycerin was the first explosive produced that was more powerful than black powder; extremely unstable, was used both in military and medical applications.
  • There is a small room with stone walls and a black floor beside the Underworld that is only accessible using noclip, used for the Underworld's water reflections.
  • The player can avoid being killed in Skull Island by being ÜberCharged, drinking Bonk! Atomic Punch, or deploying the Dead Ringer as the time-limited explosion occurs.