One of my friends sent me a link to Settlers3D, a 3D version of the board game Settlers of Catan. This is one of the best mid-complexity board games ever created, and I highly recommend checking it out. This 3D version doesn't let you play against a computer opponent, but Java Settlers does. You can find some rules there too. If anyone wants to play a network game with me, shoot me an email. My address can be found on the left side of the blog.