Cat Bullet Bill

Cat Bullet Bills are a species of Bullet Bills powered-up by a Super Bell that appear in Super Mario 3D World.

Like normal Bullet Bills, Cat Bullet Bills are fired from Bill Blasters. However, unlike normal Bullet Bills, Cat Bullet Bills will lock onto, and follow the player, making them similar to the Bull's-Eye Bill. However, unlike Bull's-Eye Bills, Cat Bullet Bills always follow a horizontal path; they can't travel vertically.

Cat Bullet Bills will sometimes drop a Super Bell when defeated. In the level The Bullet Bill Express, Cat Banzai Bills appear, which act as homing Banzai Bills.

They are set to appear in Super Mario Maker 2 as enemies that can be added to courses, as depicted solely in promotional artwork.

Trivia

 * While a Cat Bullet Bill appeared on the early box art for Captain Toad: Treasure Tracker, they were removed on the later box art and do not appear in the released game; instead, they were replaced with Bull's-Eye Bills.