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

World 2 is the second world of the game Super Mario World 2: Yoshi's Island and Yoshi's Island: Super Mario Advance 3. It consists of 10 levels, and like every other world, it has six regular levels, a Fort, a Castle, an extra level, the Scratch and Match Bonus Game, and a secret level (GBA only). Most of the levels in the world are set on forested mountains or in dusky uplands.

List of Levels in World 2
Here are all the levels in World 2:

Visit Koopa And Para-Koopa
The first appearance of Koopa Troopa alongside with Koopa Paratroopa. This level is very mountainous and has a lot of falling rocks that can crush Yoshi or simply fall into a pit. Poochy also makes an appearance in this level. In one area, the screen scrolls slowly upwards as Yoshi has to avoid falling rocks that pile-up on each other Tetris-style. Also, this is the first time Baby Mario can morph into Superstar Mario.

The Baseball Boys
Both Sluggers and Green Gloves team up here, to create a pitcher and a batter. The player must watch out, since the eggs they throw or deflect back might push the player into a hazard such as Spikes.

What's Gusty Taste Like?
This is Gusty's first appearance in the game, and half of the level takes place in a forest, while the other half takes place in a cave. A bonus minigame room is also located here as well.

Bigger Boo's Fort
A fort with many Boos and Big Boos. This is also the first appearance of Boo Man Bluff. Many Fangs aid Bigger Boo in the fight, and a lot of ! Switches can be found in this level too.

Watch Out For Lakitu
Lakitu, Cactus Jack, and a Pokey make their first appearances throughout the game. This stage has a lot of Shy Guys in it, and is also the first time that Yoshi is able to transform into a Train.

The Cave Of The Mystery Maze
The player starts outside in the beginning of the level. They are soon in an underground room once they hit the Winged Cloud containing a door. The player is then in a smoke filled room, and carefully advances to reach another room that leads outside to a beachside area.

Lakitu's Wall
Many Wall Lakitus are seen in this level. The player is also in a mountainous area, filled with falling ledges and coins. Fat Guys make their first appearance here too.

The Potted Ghost's Castle
The boss of World 2, along with two Green Shy Guys aiding him. This level contains many areas in which Yoshi is inside a pipe, along with thorns. Yoshi is also able to transform into Train Yoshi in this level.

Hit That Switch!!
The second Extra level in the game. The player has to quickly advance while hitting the ! Switches and avoiding Piranha Plants. There is also a pipe in the beginning that contains stars, which is the only time the player is able to get them too.

Mystery of the Castle?
This level contains a maze which is very complex. There is also a section in which the player needs to ride Flatbed Ferries in order to advance throughout the level.

Bonus-2
Collecting 800 points (700 in the remake) unlocks Scratch and Match to play anytime.