Cannonballs

Cannonballs, also referred to as cannon fire, are fast-moving enemies which try to target the player. These Tracker enemies are able to multiply by 2 but decrease in size when colliding with a surface, and can be manually split with a Bubble.

Enemy
Cannonballs are Tracker enemies which move at high speeds. They are able to multiply by 2 but decrease in size by 50% when colliding with a surface. You can manually split them with the Bubble move, and they go extremely slow when not tracking the player. The speeds quickly increase by a lot after a bit of time.

Tactics
While splitting them with the Bubble Move is partially useful, it is risky and is recommended only when in multiplayer, where you are able to revive others with the Bubble move. While you can temporarily find cover if fast enough as they have no explosion radius, when split they scatter across a great distance and go through flaws in your cover, such as openings.