 One of the major forms of interaction is player vs. player combat, where the dynamic conflict, especially the conflict between Good and Evil plays a dominant role in Achaea.The other play mechanics include the free market economics, which allows the players to design and craft goods, and the player-run social structure, including Houses (formerly guilds) and politics.The world consists of over twenty thousand locations, known as "rooms", ranging from common countryside to more exotic and surreal environments.