Minecraft. I just started on a new map with a friend, and its generated weirdly, so there's this one mountain which is really narrow until about 3/4 of the way up where it bulges right out, making it difficult to scale. It'd be great for keeping out mobs so we thought it'd be an awesome place to put a castle, so that's what we're gonna do. The only thing we gotta do now is mine the materials.