Snifits are Shy Guys with an extended nozzle for a mouth on their mask, which along with the dark coloration causes it to resemble a gas mask. There are many variations of Snifits.
Yume Kōjō: Doki Doki Panic/Super Mario Bros. 2
Super Mario World 2: Yoshi's Island
Super Mario 64
Mario Party 3
They were also featured as Daisy's "partner" in the story mode of Mario Party 3.
Paper Mario: Sticker Star
They appear mainly in World 3 of this game. One of the Snifits actually hosts a game show called Snifit or Whiffit in Stump Glade where someone has to compete in various challenges in order to win the prize. They also appear as regular enemies.
Paper Mario: Color Splash
The Snifits also appear in Paper Mario: Color Splash. In addition, one of the Snifits from Snifit or Whiffit returns as the host.
Yoshi's New Island
Snifits show up right before the boss door in 3-4, Slime Drop Drama. They shoot bullets out of their mouths at a regular interval.
The garbageman in the 1993 Super Mario Bros. film are identified, in a single line of dialogue from Iggy, as Snifits (earlier in the movie, similarly-garbed henchmen lacking the breathing filter apparatus were likely meant to be Shy Guys, though they were not identified as such through dialogue).
- "Snifit" is a pun of "Sniff it".