Cat Bullet Bill
From the Super Mario Wiki
Like normal Bullet Bills, Cat Bullet Bills are fired from Bill Blasters (making a meowing sound effect while doing so). However, unlike normal Bullet Bills, Cat Bullet Bills will lock onto, and follow the player, making them similar to the Missile Bill. However, unlike Missile Bills, Cat Bullet Bills always follow a horizontal path; they cannot travel vertically.
They appear in Super Mario Maker 2 as enemies that can be added to courses, where they replace Bull's-Eye Bills in the Super Mario 3D World theme.
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