World 4 (Super Mario World 2: Yoshi's Island)

World 4 is the fourth world of the game Super Mario World 2: Yoshi's Island and Yoshi's Island: Super Mario Advance 3. It consists of ten levels, and it has six regular levels, a fort, a castle, and the Match Cards Bonus Challenge. Its Extra Stage is Extra 4: The Impossible? Maze, and its Secret Stage is Secret 4: Fight Toadies w/ Toadies. The world's theme is an arid, mountainous area with sand, sand dunes, and scattered trees visible.

List of levels

 * 4-1: GO! GO! MARIO!!
 * 4-2: The Cave Of The Lakitus
 * 4-3: Don't Look Back!
 * 4-4: Marching Milde's Fort
 * 4-5: Chomp Rock Zone
 * 4-6: Lake Shore Paradise
 * 4-7: Ride Like The Wind
 * 4-8: Hookbill The Koopa's Castle
 * Secret 4: Fight Toadies w/ Toadies (Super Mario Advance 3: Yoshi's Island only; known as "Fight Baddies w/ Baddies" in British English)
 * Extra 4: The Impossible? Maze

Profile
Super Mario World 2: Yoshi's Island Nintendo Player's Guide description: ''Red sky at morning, Yoshies take warning! Things got a lot hotter for the plucky babysitter as he explores the lurid landscape of World 4. When Yoshi meets a friendly face, it belongs to Marching Milde, who would love to stomp him into the ground! Koopas and Para-Koopas patrol the terrain, but they're just a warmup for the final showstopper. To get out of this world, Yoshi will have to defeat Hookbill, the biggest and baddest Koopa of them all!''