The Pigpen is a storage Building which was released on August 26, 2010. It was slowly released to all users during the day as a gift. It requires 8 Wooden Boards, 8 Nails, and 8 Bricks to build. You can have a maximum of 1 Pigpen on 1 farm, and it can be harvested every day for Truffles. The Pigpen is not animated in the iPhone version. Even if its full it looks like the empty version. However when you harvest it will count with all of the pigs you have inside.