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.

1-1: Make Eggs, Throw Eggs
This level is an easy course that teaches the player some things about the game. The level features Shy-Guys, Fly Guys and the Chomp Rock.

1-2: Watch Out Below!
The second level is easy too. However, at the beginning, Yoshi must run quickly because Incoming Chomps will fall down and create holes in the ground. This level also introduces the transformation of Yoshi into a Helicopter.

1-3: The Cave Of Chomp Rock
This level takes place inside a cave containing many Nipper Plants and Chomp Rock. The level also features a Minigame room.

1-4: Burt The Bashful's Fort
The first fort is an easy level. At the beginning Yoshi must be careful because some walls can fall down and squash him when Yoshi runs past them. The level features the Burts, Lava Bubble and much more. The boss of the fort is Burt the Bashful, a giant Burt who jumps very high. Yoshi must throw eggs at him to defeat him.

1-5: Hop! Hop! Donut Lifts
This level is slightly harder than the previous four because it is an auto-scrolling level, so Yoshi must follow the path to get to the end. The level features the Donut Lifts as says the name, which fall if Yoshi stands on them for too long.

1-6: Shy-Guys On Stilts
This is an easy level with many Shy-Guys on Stilts. This special kind of Shy-Guy cannot be swallowed by Yoshi when on their stilts. This level contains two dark cave areas. At the end, a 1-Up balloon will appear.

1-7: Touch Fuzzy, Get Dizzy
This is a forest level with a Minigame Room and many Fuzzies. It also features the extremely rare Melon Bug that helps Yoshi to defeat enemies like Tap-Taps.

1-8: Salvo The Slime's Castle
This is the first castle of the game. It is an easy level, however Yoshi must be careful with the spiked platforms and the rotating cylinders. The boss is Salvo the Slime, a giant Lemon Drop. Yoshi has to throw eggs at it to defeat it.

Secret 1: Exercise in the Skies
This is the first of the Secret Stages exclusive to Super Mario Advance 3: Yoshi's Island. As the name implies, Yoshi will have to traverse through cloud platforms and other types of airborne terrain most of the time.

Extra 1: Poochy Ain't Stupid
This is the first Extra Stage in the game. The main focus of it is Poochy, who Yoshi must ride on to get past the level. If Yoshi falls off of Poochy, he'll fall into lava and lose a life.

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.''