Balloon Boo

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Not to be confused with Boo Balloon.
Balloon Boo
Species Origin Boo
First Appearance New Super Mario Bros. (2006)
Related Species
Big Boos
Some Boos and a Balloon Boo.

Balloon Boos are enemies that appear only in New Super Mario Bros., where they are encountered in World 4-Ghost Icon.png. They are Boos with pink cheeks, and their tail resembles that of a balloon, akin to their name.

They appear large at first, but when looked away from, they approach to the player while expelling air and shrinking. Otherwise, they stop and inflate by inhaling air at a rather slow rate, until it has assumed its massive appearance once more. Balloon Boos will continue to chase Mario or Luigi even when they have reached their minimum size; they will also only chase them if they are in the same room (i.e. there are no walls between them). Balloon Boos can be defeated with a Blue Shell or a Mega Mushroom.


  • When Mega Mario (or Mega Luigi) collides with a Balloon Boo, it pops and soars away in circles, somewhat reminiscent to destroying a Goal Pole with this same form.
  • Balloon Boos bear a slight resemblance to a Fwoosh, based on its redesign from Super Mario 64 DS.