In the Clouds

In The Clouds is level 4-3 in Yoshi's Island DS. It is by far the only level where the player can bounce on clouds, which make faces at Yoshi if he stands long enough.

An Inside Look At "In The Clouds"
The stage starts of with many coins and the moving platforms were replaced by clouds. There is also a pipe, and is the only one, in the second part of the stage when after going through it, if the player touches the morph bubble, the player can turn into Yoshi Helicopter. The third part of the stage is where the player has to utilise on how to use the rotate blocks which turn the ! blocks on and off. The fourth and final part of the stage is where the screen automatically moves, and the background has also changed from dawn to dusk. The player must advance and reach the goal.

Trivia
Also, the whole entire stage (except for the Goal! Point) is made up of entirely clouds, which is why the stage's name is In The Clouds.