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For more information on this article, visit the Hub page on the Doom Wiki.

A hub is a cluster of interconnected levels.

Etymologically, a MiniWikipediaLogoIcon.pnghub is the central part of a wheel, which connects all the spokes. The metaphor is often used for anything that connects together a large number of identical things. In ZDoom, a hub is technically an entire cluster of levels. The term is also sometimes used in a way closer to the original image, by qualifying one level in particular to be the hub for a cluster, for example the DoomWikiLogoIcon.pngSeven Portals map of Hexen is the map from which all other maps in the cluster can be reached.

To define a hub, at least two maps need to be in a single cluster, which needs to have the hub keyword in its cluster definition. Many features work differently depending on whether the current level is part of a hub or part of a "normal" cluster of sequential levels.

  • ZDoom saves the status of each visited level in the cluster. In a non-hub cluster, revisiting a level resets it.
  • There is no intermission screen with kill/item/secret tallies between hub levels.
  • The inventory remains unchanged when traveling between hub levels; except for Powerup items without the INVENTORY.HUBPOWER flag.
  • By default, the automap does not show the map label when in hub maps.