Fuzzler

Fuzzlers are caterpillar-like enemies that appear in Super Mario 3D World and its Nintendo Switch port, Super Mario 3D World + Bowser's Fury, and are predominantly seen in Switchboard Falls. Their name is a portmanteau of "Fuzzy" and "Wiggler," which they resemble a cross between. Fuzzlers are made up of yellow, orange, and golden spiky balls that damage the player upon contact. Fuzzlers always appear on Switchboard tracks, and they roll along the tracks in a set path. Two or more Fuzzlers usually appear in a track network, each one going in a separate direction. When Fuzzlers collide, they start moving in the other direction. They can be defeated only with Invincible Mario, White Tanooki Mario, and Lucky Cat Mario.

In the Bowser's Fury mode of Super Mario 3D World + Bowser's Fury, Fuzzlers with cat-like ears and tails additionally appear on Mount Magmeow. Several cat Fuzzlers can briefly be seen without their spikes in the cutscene that plays upon the player activating the "Hurry! Steer the Switchboards!" Cat Shine on Mount Magmeow.