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A tile is the primary building block of a map in RPG in a Box. Tiles are typically used to construct the ground, buildings, and other structures, and can be independently placed at any XYZ coordinate within the map. A tile's coordinate is unique among other tiles in the same map, as only one tile is permitted per XYZ coordinate. As the player character and NPCs move around the map, any tiles they step onto will act as terrain and determine the vertical positioning of the characters.