Gilbert the Gooey is a boss that is battled by Blue Yoshi in Yoshi's Island DS. He was enlarged by Kamek, like most bosses in the game. He has balloon-like spheres that Blue Yoshi must pop in order to defeat him. He only attacks by swinging side to side and by moving up and down. He also can be defeated very easily if Blue Yoshi has Baby Donkey Kong, because of his eggs that explode on impact.