Cluster

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A cluster is a group of levels linked together. ZDoom uses cluster for two main purposes: hubs and episodes. In a hub, all visited maps that are part of the same cluster as the current map are kept in memory. This allows to find them as they were left each time. In episodes, be they self-contained like in Doom or sequential like in Doom II, clusters are only used for intermission screens.

Cluster are defined in MAPINFO.