Cauldron

Cauldron is a Somewhat Tricky Track that is featured on a mysterious pot. Bloons come out of the top of the pot and go down the light blue squiggle. There is a fire at the bottom of the cauldron. You can't place towers on the fire, but you can place them on the coal. There is space over the hills in the background. You can place regular towers on the pot and the background. there is also some water spilling out of the cauldron, so you can place Buccaneers, Pontoons, and Tribal Turtles here as well.

Trivia

 * Apparently, this is where some bloons come from...