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 Para-Koopa. 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 -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 a train 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.