Two Barney Bubbles appear in the level Monkeys' Favorite Lake. They quickly run back and forth. Red Yoshi cannot eat a Barney Bubble, and can only defeat it by throwing an egg at it. Whenever Red Yoshi stomps on a Barney Bubble, it produces bubbles, which Red Yoshi can eat and spit out for a variety of uses. Bubble Dayzees produce the same type of bubbles.
In Yoshi's Island: Super Mario Advance 3, two more Barney Bubbles appear in the World 6 Secret level, Endless World of Yoshis, during the forest area, making there a total of four Barney Bubbles.
Player's Guide:Stomp on him and he'll blow bubbles, which you can then swallow and spit out.[1]
Shogakukan guide:「踏むとアワを吹くおもしろキャラ。吹かせたアワを食べるとアワを吹けるようになる。」[2](An amusing character that blows bubbles when stepped on. If you eat the bubbles that you make it blow, you will be able to blow bubbles.)