Oil Spill

Oil Spill is a Devastating Master Track in BTD6. (Unlocked at Rank 70)

Overview
What a spilled oil in the seas!

There are 2 paths for the bloons to travel; on land and on oil. You can place LAND towers on small group of islands, but not on affected sea. Since the sea was affected due to oil spill, you cannot place WATER towers on oil or else they will be toxified by it!