This is a 2 (or more)-Player map wit two 50x50 block square, surrounded with bedrock an unbreakable wall and barrier blocks. This is because it's not that fun if the second person is cheating. There's also a button to reset the side and a lever to tell the other that you're finished. If both people have flipped the lever, a countdown starts. Then the wall disappears. Now you can fight or visit the other's side or do something else.