We launch massive multiplayer online role playing game. The terrain map of the game of the present invention includes multi-layer terrains in which at least some of the player areas overlap each other, and each of the multi-layer terrains includes a plurality of polyprisms accessible independently of one another and disposed adjacent to each other . Therefore, since the game terrain map is composed of a collection of accessible poly- sists rather than a regular map, a large number of poly prisms for the same repeated terrain can share resources to dramatically reduce the amount of game data, The development cost can be greatly reduced and the terrain can be modified in response to the conditions in real time, which can double the interest of the game with various terrain changes.
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