World 3 (Yoshi's Island DS)
From the Super Mario Wiki
World 3 from Yoshi's Island DS first takes place in a tropical beach area, but the second half is in a desert cavern area. The bosses of World 3 are Bessie Bass and Priscilla. Yoshi and friends meet Baby Wario in this world, who joins the party at the start of level 3-5 and accompanies them throughout the rest of the world. At the end of the world, however, Baby Wario leaves the party and joins a group of Bandits.