Ring of Fire

Ring of Fire is a volcano-themed Advanced track with one entrance and one exit. Bloons enter from the strip of rock at the bottom, circle the lava pool in a clockwise direction once, then exit at the same strip of rock.

Towers cannot be placed on the volcano or lava. The lava produces volcanic gasses, blocking vision. This means that towers cannot shoot across the lava pool.

This and the lack of usable space are why this is an Advanced track.