A trading game for one or two players. In this game, you need to buy supplies for your castle. There are many options to choose from that change up the details of the game, but the basics are the same. A boat pulls up to the dock with items for sale. You choose the items you want to buy and sell, then send the boat over to the other castle. You can play against the app or two people can play (with the device between them, each of them looking at their own half of the screen facing them). Game play includes logic, simple math and some strategy if you want (does the other castle need a supply I have? Do I want to be helpful or comptetive?). There are a lot of instructions you can read, or you can jump into game play and figure it out by trial and error.
