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A Dungeon (ダンジョン, Danjon?) is any type of adventuring location in MMO games, which is designed like a labyrinth or maze-like structure that has numerous paths, monsters, and rooms (for closed dungeons). Two main types of dungeons exist in Sword Art Online: Labyrinths (迷宮区, Meikyū-ku?) and sub-dungeons.


In Aincrad, Labyrinths are tower-like structures with many floors that connect each Aincrad Floor to the next. The only unifying feature among Labyrinths is their 100 metre height, as each Labyrinth has an individual scale and design. Some may be bulky and squat with uniform width, others are narrow and willowy.[1]

Within each Aincrad Floor in Sword Art Online, one or more[2] Field Bosses were strategically placed somewhere between the Teleport Gate and the entrance to each Labyrinth in such a way that the Labyrinth could not be accessed until this boss was defeated.[3]

The inside of a Labyrinth is populated with numerous monsters, some of which respawned in approximately five minutes in Sword Art Online. Pale-blue lights are situated high above the Labyrinth floor to provide a modicum of lighting.[4]

The Boss Room of a Labyrinth must be found on the topmost Labyrinth level and cleared before the stairs to the next Aincrad Floor would be opened. In Sword Art Online, the walls of the staircase leading to the next Aincrad Floor contained thematic hints regarding the content of the following Floor. The most striking and memorable hint was a relief etched into the closed double-doors at the top of the stairs. Pushing these two stone door halves apart in the middle opens the door.


Labyrinths in Sword Art Online are literally mazes, full of difficult winding paths, traps, hidden rooms, and dead ends. Because of the difficulty of the paths, it often takes Front Line players a week to "map" the labyrinth on average, before the Boss Room is found.

At that point, Front Line players typically hold a meeting to strategize the Boss Battle. Several expeditionary parties are sent to gather information on the Boss before a real raid is attempted.

Between the Closed Beta Test and the Official Release, the labyrinth maps were likely changed, since it took more than a month for the first floor Boss Room to be located.

Labyrinth Features[]

Klein entering a Safe Area.

Safe Areas[]

Most dungeons have a handful of safe areas, where monsters do not enter and attack players. They can be recognized by a special colored torch placed in the four corners on the wall. Although it is possible to stay in safe areas for several days on end, it is described as a particularly discomforting and sleepless experience, since nearby monster footsteps or growls can be heard frequently.

Boss Rooms[]

A Boss Room is an enormous room, located at the topmost floor of a Labyrinth in each Aincrad Floor. These rooms house doors to the stairs that lead to an upper Aincrad Floor, but these doors are protected by a powerful monster, called a boss, which requires large raiding parties to take down, that resides within the Room. After a boss is defeated, it will never re-spawn in the game.

The Army players in The Gleam Eye's Boss Room.

The shape of the room differs from Floor to Floor. For example, the 1st Floor Boss Room was the shape of a rectangle, while the 74th Floor Boss Room was the shape of a dome. However, all Boss Rooms have several things in common. First of all, each one has only 2 entrances/exits: 1 from the Labyrinth below and 1 on the other side of the room leading to the next Floor. Although these doors usually stay open in SAO, allowing players to retreat from the Boss Fight if necessary, as the Bosses never leave their designated room, however, starting with the 75th Floor, the door would be sealed as soon as the players enter the room, preventing any chance of retreating. The Boss Rooms in New Aincrad are always sealed within 1 minute of entry, which is the time it takes for all the flames in the room to light up and form a circle and is considered as time given to players to prepare for the battle. The waiting time can be cancelled by pressing a stone button on the wall next to the door.

The Labyrinth-side entrance's appearance is usually a sign of the toughness of the boss inside: the lairs of weaker bosses usually have crude and rough entrances, while the lairs of powerful bosses are usually grim and made out of smoothly polished materials. All Boss Rooms are also quite dark, with many torches or other light sources, which only light up when the Boss Fight begins and dim out as soon as the battle is over, spread out throughout the room. Boss rooms starting with the 74th Floor come with Anti-Crystal Fields, which prevent the use of any crystals, including teleportation crystals, within the Room.


Another type of dungeon that exists in the SAO universe is called a sub-dungeon in SAO or just dungeon in other games. In Aincrad, these dungeons are not important to the clearing of the game, so Clearers do not take the time to clear them, therefore, they are mainly cleared by middle level players. This type of dungeon also exists in ALfheim Online and is the main type of dungeon in the game until New Aincrad is implemented into the ALO universe. This type of dungeon also exists in other VRMMOs. For example, there is a huge ruins dungeon beneath SBC Glocken in Gun Gale Online.

List of known sub-dungeons[]

Sword Art Online[]

ALfheim Online[]

  • Jötunheimr.
  • Thrymheim (the Inverted Ice Pyramid in Jötunheimr).
  • The North, East, South, and West dungeons of Alne city.

Gun Gale Online[]

  • Ruins dungeon beneath SBC Glocken.

Anti-Crystal Zone[]

The Black Cats triggering an Anti-Crystal Zone trap.

One of the most lethal, but rare, traps in Aincrad's dungeons is the Anti-Crystal Zone (結晶無効化空間, Kessho Mukou-ka Kūkan?) trap. As the name suggests, this kind of trap prohibits the use of crystals, disabling the players from teleporting and healing themselves with crystals in battle. While crystals can not be used, other items such as healing potions can be used but those take longer to use.

As a result, players who enter Anti-Crystal Zone rooms are forced to defeat all enemies, face death, or somehow escape through unconventional means. Beginning with the 74th Floor, Boss Rooms also became Anti-Crystal Zones.

Known Anti-Crystal Zones[]



Aincrad Locations Navigation Bar
Teleport Gate
Floor Notable locations and landmarks
1 Town of Beginnings, Black Iron Palace, Hidden Dungeon, Monument of Swordsmen[Navbar 1], Monument of Life[Navbar 2], Chamber of Resurrection[Navbar 3], Tolbana, Horunka Village, Medai Village
2 Urbus, Urbus Teleport Gate Plaza, Marome Village, Taran Village
3 Forest of Wavering Mists, Zumfut, Zumfut Teleport Gate Plaza, Dessel
4 Rovia, Rovia Teleport Gate Plaza, Bear Forest, Yofel Castle, Usco Village, Caldera Lake
5 Karluin, Karluin Teleport Gate Plaza, Mananarena, Shiyaya
6 Stachion, Stachion Teleport Gate Plaza, Suribus, Ararro Town, Castle Galey, Lake Talpha, Cave City of Goskai, Murutsuki Village
7 Lexio[Navbar 4], Lexio Teleport Gate Plaza, Verdian Prairie, Volupta, Volupta Grand Casino[Navbar 5], Volupta Beach[Navbar 6], Volupta Grand Casino Monster Arena[Navbar 7], Plamio, Skeleton Prairie,[Navbar 8] Forest of the Shaky Boulders, Halin Arboreal Palace[Navbar 9], Ant-Crossing Ravine, Tribra Village
8 Frieven Village, Frieven Teleport Gate Plaza
9 Dark Elf Queen's Castle[Navbar 10]
10 Thousand Snake Castle[Navbar 11]
11 Taft, Taft Teleport Gate
19 Ralberg, Ralberg Teleport Gate, Hill of the Cross, Griselda's Tomb
20 Sunshine Forest
22 Coral Village, Coral Teleport Gate Plaza, Forest House K4, Lake Outside Coral Village
24 Panareze, Panareze Teleport Gate Plaza
25 Giltstein, Giltstein Teleport Gate Plaza, Former location of the Knights of Blood Headquarters
27 Ronbaru Town, Ronbaru Teleport Gate
28 Wolf Plains
35 Forest of Wandering, Mishe, Mishe Teleport Gate Plaza
39 Nolfret, Nolfret Teleport Gate Plaza, Former location of the Knights of Blood Headquarters
40 Jaileum, Jaileum Teleport Gate Plaza
46 Ant Hill
47 Floria, Floria Gate Plaza, Hill of Memories, Forest of Giant Flowers
48 Lindarth, Lindarth Teleport Gate Plaza
49 Myujen, Myujen Teleport Gate Plaza
50 Algade, Algade Teleport Gate Plaza
55 Granzam, Granzam Teleport Gate Plaza, Knights of Blood Headquarters, West Mountain
56 Pani, Divine Dragon Alliance Headquarters
57 Marten, Marten Teleport Gate Plaza
59 Danac, Danac Teleport Gate Plaza
61 Selmburg, Selmburg Teleport Gate Plaza
65 Old Castle Labyrinth
66 Old Castle Labyrinth
72 Ozmalt, Ozmalt Teleport Gate Plaza, Agarla Village
74 Kamdet, Kamdet Teleport Gate Plaza
75 Collinia, Collinia Teleport Gate Plaza
100 Ruby Palace
  1. Only in New ALO
  2. Only in the SAO official service
  3. Only in the SAO Beta
  4. Progressive Volume 7, Rhapsody of a Red Blaze, Part 1
  5. Progressive Volume 7, Rhapsody of a Red Blaze, Part 3
  6. Progressive Volume 7, Rhapsody of a Red Blaze, Part 2
  7. Progressive Volume 7, Rhapsody of a Red Blaze, Part 4
  8. Progressive Volume 7, Rhapsody of a Red Blaze, Part 6
  9. Progressive Volume 7, Rhapsody of a Red Blaze, Part 9
  10. According to Kizmel in Progressive Volume 3, Barcarolle of Froth, Part 7
  11. According to Kirito in Progressive Volume 1, Aria of a Starless Night, Part 14
ALfheim Online Locations Navigation Bar
Midgard New Aincrad - See Aincard Location Navigation Bar for locations in new Aincrad
World Tree Alne - Virtual Lab (Floating City) - Yggdrasil City
Alfheim Ancient Forest - Butterfly Valley - Swilvane - Legrue Corridor - Legrue - Thule Island - Undersea Temple
Jötunheimr Great Void - Thrymheim