Siege

 is an Advanced track that is exclusive to Bloons Tower Defense 5 Mobile. It was released in version 3.10 (August 15th, 2017).

Overview
As said, this track has 4 entrances and 4 exits. All of the entrances comes from a dead looking forest and all of the exits lead to the castle. There is also a small moat near the exits where you can place water towers. To try to avoid confusion, the first entrance leads to the third exit, the second entrance leads to the fourth exit, the third entrence leads to the first exit, and the fourth entrence leads to the second exit.

