World 1 (Super Mario World 2: Yoshi's Island)

World 1 is the first world of Super Mario World 2: Yoshi's Island and Yoshi's Island: Super Mario Advance 3. The world contains eight normal levels; its Extra Stage is Extra 1: Poochy Ain't Stupid, and its Secret Stage is Secret 1: Exercise in the Skies. The world's theme is a grassy plain in spring. Collecting 800 points (700 in the remake) will unlock the Flip Cards Bonus Challenge to play anytime.

List of levels
The following is a list of each level in World 1.

Profile
Player's Guide description: ''It looks like a perfect spring day as Yoshi and Baby Mario begin their journey. The sun shines brightly down on butterflies floating through a meadow. Things are not what they seem, though. Sinister forces want to grab Mario! In World 1, you'll learn all the basics of babysitting on Yoshi's Island, including flying, egg throwing, and ground pounding. You'll plumb the dark depths of Chomp Cavern and climb mountains on the fast and furious Donut Lifts.''