Boulder Nightmare

"Bloon activity has been picked up in this collection of ancient rock formations, at the same time an unnatural haze has fallen over it. Bring your best Bloon-popping abilities to figure out just what's going on here."

Boulder Nightmare is an Advanced difficulty map. The map takes place in a large collection of rock formations, with heavy haze noticeable on the map for much of the time. The Bloons will spawn alternating between the left and right sides of the central rock formation, and cannot be hit while underneath the formations on the track. MOAB-Class Bloons will fly over the small formations and will not gain such immunity. The rock formations cannot be built upon, although the gray piles in the corners of the map are destructible.

A lightly modified version of Boulder Nightmare is the track on which the Rocks Fall, Everything Pops special mission is based.