Welcome To Yoshi's Island

Welcome to Yoshi's Island is a one-time playable level (a "one time thing") in Super Mario World 2: Yoshi's Island and its remake, Yoshi's Island: Super Mario Advance 3. It can only be played when a new game is started. It is mainly a tutorial in which Yoshi learns about Baby Mario, as well as using Expansion Block and collecting coins. The level is very basic and short, with only few Shy Guy enemies strolling around, making it easy enough for beginners. As this mini-level ends, Yoshi begins level 1-1, Make Eggs, Throw Eggs. The level is also used as the final section of Endless World of Yoshis, with the addition of Kamek attacking Yoshi every few seconds like in the first room of 6-8.

Trivia

 * The very start of the level resembles Yoshi's House from Super Mario World.
 * The color of the Yoshi played will be the current Yoshi the player is using on the most recently selected file.
 * The music is unique to this level; however, it is played in part of the remake's Endless World of Yoshis.
 * In the GBA version, if a player gets a game over on this level and chooses to end, the file will say that the level is World 0. In the SNES version the player is given infinite lives for this level and thus cannot get a game over.
 * This level is also called World 0 if the player pauses during the level, it says World 0 at the top, and at the bottom it says the level is World 0-0.
 * This is the only level not to have collectibles, so if a player pauses during the level, there will be dashes next to the collectibles count.