Windward

Windward is an action-filled multiplayer sandbox game that puts you in control of a ship sailing the high seas of a large procedurally-generated world. Designed from the start to be a fully procedural co-op game, Windward can be played by yourself, but it truly comes alive when playing with friends. Start by generating a procedural world that will be unique to you, design your own custom faction then sail forward fighting pirates, trading with towns, doing quests or simply exploring -- it's up to you how you want to play.