Quest for Yap

Quest for Yap is a free multiplayer space strategy game involving trade, combat with other players, the mysterious commodity Yap, 7 races and dozens of ships giving endless possibilities. 2 game flavors: The Original game, where players can build up planets as strongholds and money comes from trade, and the Melee game where combat reigns supreme.

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http://www.yapquest.com/YAP.htm