Glass Cannons

Glass Cannons (referred as Crashers or Throwing Glass Cubes or The Thing) are obstacles encountered in Checkpoint 7 and Endless Mode. They fire cubes out of circular holes with cannons inside them. The cannons emit light when preparing to fire. The Mayhem Boss also has a cannon, from which it fires cubes.

How it works
The glass cannon works by detecting how far you are from the obstacle. Once close enough, the cube will be fired (smoke comes out as well), and you need to throw balls to smash it. Occasionally throwing a ball at the cannon before it fires will make the cube fall down.