World 4 (Yoshi's Island DS)

World 4 is the fourth and second-to-last world in Yoshi's Island DS. The first half takes place in the sky, and the second half has an ice theme. At the start of the second half of the world, in level 4-5, Baby Bowser encounters Yoshi and his party, and decides to join them on their adventure. However, this alliance is short-lived, as at the end of the world, Bowser abandons the party as he attempts to go off with Kamek, just like Baby Wario in World 3. World 4, like all worlds in the game, has a total of ten levels, although two are secret, and two bosses, in this case Six-Face Sal and Big Guy the Stilted.

Levels

 * 4-1: Rock 'n' Fall
 * 4-2: High-Speed Cart Race
 * 4-3: In the Clouds
 * 4-4: Six Face Sal's Fort
 * 4-5: Friend or Foe?
 * 4-6: Slip Slidin' Away
 * 4-7: Teeth-Chattering Chill Zone
 * 4-8: Castle of Big Guy the Stilted
 * Secret 4: Hurry and Throw!
 * Extra 4: Let There Be Light!