This is a 2x2 doorway tile meant to be compatible with OpenForge. There are a few door styles available to download in other files, so I won't include them here. Insert a pin through the hole, and through the door you choose to print out and it will act as a hinge. This tile has a hole in the bottom so you can insert a 3/16" x 1/16" neodymium magnet to fasten it to a magnetic playing board.