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4D exist out of 4 Dimensions. Each Dimension consists out of different zones, with its own quests, adventures and secrets, all consistent with the Time Period. To have a closer look at the different zones, just click on the dimension you're interested in, and you'll get a more detailed look of how the dimension is setup.
Next to those 4 Dimension there's also a Central part, where people can gather, and talk about things, or find information concerning other areas in the game.