After Kirby defeats Kaboola and gets a Sparkling Star, he continues on to Bubbly Clouds.

Stage 4, Part 1
Go to the right, and a Waddle Doo will slowly walk toward you. Float onto the cloud on the right, and there is a Gordo that goes up and down. There will also be a Dizzy that falls down from above, near the Gordo.
After that, there is a Shotzo cannon that shoots at different angles, and a Bronto Burt that flies from right to left in the sky above the Shotzo. To the right of the Shotzo, a Waddle Dee walks back and forth on another cloud platform.
As you go to the right, be careful of the Bronto Burt that comes down from above and then charges toward you, as well as a Dizzy that goes from left to right toward you. There is also a Waddle Dee near this area that walks back and forth, and sometimes hops upward.
To the right of that, you encounter your first Scarfies. Don't inhale them! If you try, they will just get angry and charge toward you, and will explode when it hits you. Instead, press up to inhale a puff of air, move a short distance away from a Scarfy, and blow the puff of air at it. It will explode and disappear.
After the three Scarfies that appear above the gap, there are two Scarfies on the right.
After that, there is a Kookler that spins around in a circle. This is followed by two Kooklers spinning around above a gap.
After the gap, some Waddle Dees and Waddle Doos float down on parasols. Then there is a Bronto Burt that flies from right to left across the sky, and a Shotzo cannon that shoots three cannonballs downward while floating with a parasol.
After the cannon, two Dizzies float up from below, and three Bronto Burts fly from right to left across the sky.
After that, go through the door.
Stage 4, Part 2
A Sir Kibble will walk toward you, then it stops and throws a boomerang at you. After several Sir Kibbles, there is a Waddle Doo that shoots a rotating beam, and another one just before a spiky area.
Just after the spiky area, there is another Sir Kibble. After that, there are two Puffies that float up and down toward you, and three Bronto Burts that come down from above, then all try to charge toward you.
Then, two Scarfies float up from below, followed by two Waddle Dees that walk toward you. Then there are two Bronto Burts that fly up and down from the right side of the screen to the left.
Then there is a Sir Kibble just before a door. Go through the door.
Stage 4, Part 3
There is a Waddle Dee to the right that walks back and forth, then stops and jumps up.
After that, as you float up, watch out for the Kookler that moves randomly above you. There is another Kookler to the left. Then there is a Dizzy that bounces around.
Float upward, and there is a Waddle Dee to the right that goes back and forth, then stops and jumps upward.
To the right of that, there is a Kookler that spins in a circle above you. After that, you can optionally go to the dead end on the left, past another Kookler, and press up to go through the secret door at the end. There you will find a Mint Leaf on the platform below, and you can fly to the right to find an Energy Drink, some Kooklers, and a Maxim Tomato. After the Maxim Tomato, go down and to the right, past some Puffies, to find a 1up on a column near the bottom of the screen. Then there are some Dizzies, and some Bronto Burts. Go through the door at the end and skip to Kracko Jr. on this page.
If you don't want to get the power-ups mentioned in the previous paragraph, go to the right instead of the left, and there is a Gordo that goes up and down, and left and right. Get past it, then get past the Dizzy that bounces around. This is followed by a Scarfy, which is followed by a Sir Kibble.
After the Sir Kibble, go through the door to face a miniboss.
Kracko Jr.
You will fight an eyeball with four orbs that spin around it. Kracko Jr. will float up and down, and left and right. It will sometimes drop four cannonballs, which you can avoid by staying in the bottom corner of the room farthest from Kracko Jr. It also drops Waddle Doos that shoot rotating beams. Inhale a Waddle Doo and try to spit it at Kracko Jr. without getting too close.
After you defeat Kracko Jr., touch the Warp Star to continue to the next part of the stage.
Stage 4, Part 4
You'll fall down a waterfall into a pool of water, and there is a Mint Leaf to the left. Touch the Mint Leaf and you will automatically start flying, and you can spit unlimited air puffs until the effect wears off. Fly to the right, and you find a wall of Star Blocks. The wall has two Energy Drinks and a Maxim Tomato. Avoid the Gordos and try to reach all three items.
Then float to the right and up to reach a maze-like area of blocks. There are Waddle Dees going back and forth on some of the platforms in the maze. Go to the bottom of the maze, then float to the right while avoiding the spikes below. When you reach the right wall, float up to the top, where there is a door and a Scarfy. Go through the door.
Touch the Superspicy Curry and you will start flashing. You can now spit flames by tapping the inhale button. Go to the right and destroy all the Star Blocks with flames (the falling stars don't hurt you), but beware of the holes in the floor. Be sure to float past them. At the end, go through the door.
Stage 4, Part 5
As you float up this room, beware of the Sir Kibble that throws a boomerang at you, the Puffy that flies straight across the screen toward you, two Waddle Dees that try to fall on you from their parasols, a Bronto Burt that spins around and then charges toward you. At the top of the room, two Waddle Dees and a Waddle Doo float down from parasols and land on the platforms. Ignore the door if you want a 1up and two Maxim Tomatoes, but if you want to just go to the boss instead, you can go through the door and skip to Kracko on this page.
If you want the Maxim Tomatoes and 1up, make sure you're not standing in front of the door, and float up and touch the moon to go to a secret area where two Maxim Tomatoes and a 1up are falling downward. Be sure to get them before they fall down past the floor at the bottom of the screen, or you'll lose them. Then go through the door at the bottom to reach the boss of this stage.
Kracko
The eyeball from earlier appears and creates a spiky cloud around itself. Kracko will sometimes shoot two spinning beams around itself. Sometimes it will swoop in a U shape, so be sure to jump or float over it. Sometimes it just floats in a straight line from one side of the screen to another. It sometimes spits out a Waddle Doo, so inhale it, and spit it at Kracko when you're far away from it, to avoid its spinning beams. The Waddle Doo also shoots a spinning beam if you don't inhale it soon enough, so beware.
After you defeat Kracko, touch the Sparkling Star to clear the level and continue to the final stage, Stage 5: Mt. DeDeDe.