World 4 (Yoshi's Island DS)

World 4 in Yoshi's Island DS takes place in the mountains of Yoshi's Island, becoming snowier and colder in the second half as Yoshi scales greater heights. In World 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, Baby Bowser abandons the party as he attempts to go off with Kamek. World 4, like all other worlds in the game, has a total of ten levels; six regular, two hidden, and two bosses. The bosses in this world are 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!