The Central Hub can be accessed from the 2-cube-door area. It contains the 4, 8 and 16 cube doors, which lead to the 4-cube ruins, the 8-cube Zu city and the 16-cube Zu city. It also contains a door that leads to the main hub. Upon entering the central hub, Dot will say "it looks like some sort of important door place" (not exact words).

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