"We're going to try our best to explain the game as we understand it, but we're almost certain to fall short. It's an MMO, but one that's limited to 200 players per server. Players are tasked with exploring the game's beautiful, constantly shifting environment and growing and defending their home town by disabling and exploring fortresses.
The unusual thing about these bases is that they're dynamically generated by the environment depending on how far you've progressed in the game and the items you've already found. And each fortress -- and by extension, the method used to disable them -- is unique."