Jam:Bowling balls

Bowling balls are hazards in the Jam game Frantic Dream.

Appearance
They are gray balls with three black holes. It appears that a blurry filter was added to the sprite.

Game information
The spawner appears in the same spot at the left wall of the Challenge Room when the green indicator on the screen reads "!!! BOWLING !!! [sic]". Once activated, the spawner will start shooting a single bowling ball that will bounce around in a random path. They cannot be defeated.