How to clear Yoshi's Island 4 in Super Mario World for the Super Nintendo Entertainment System and Game Boy Advance.

How to Clear Yoshi's Island 4
There is a hidden 1-Up Mushroom above the start of the level. To get it, if you have Yoshi, you can wait for the Cheep Cheeps to hop out of the water and hop on the leftmost one while holding B, then press A to jump off of Yoshi's back and try to land on top of the hidden Mushroom Platform above the top of the screen. Then run from left to right so that you fall and land on the platform with a Prize Block above it. The 1-Up Mushroom will fall nearby for you to take.
At the start of the level, there will be a Yellow Block on the right if you visited the Yellow Switch Palace. It contains a Super Mushroom.
After that, there is a Dragon Coin on a Floating Island Platform. The platform will sink while you stand on it, then will float back up when you jump off of it.
After the floating platform, there are four coins, followed by a Prize Block that contains a Super Mushroom or Fire Flower.
Next, there is another floating platform with a Dragon Coin above it.
After that, there are two floating platforms, then three coins above a pipe. There is also a Floating Mine that floats past in the water. You can't stomp on it, but Yoshi can safely jump on it and bounce off, or you can do a Spin Jump to bounce off of it. Get the coins, then go down the pipe.
From the pipe that you come out of, go to the right and you will encounter a Pokey. Yoshi can stick out his tongue to eat each segment of Pokey. If Yoshi eats Pokey's head, the next segment will turn into its head. If you don't have Yoshi, you can do a Spin Jump off of the top of Pokey's head.
Jump over the gap, eat the Red Berry if you have Yoshi, then hit the Message Block to learn how to exit levels that you have already cleared (press Start, then Select). Make sure to eat or Spin Jump on the Pokey that is to the right of the Message Block.
After another gap, there is a Prize Block that contains coins. Hit it rapidly to get as many coins out of it as you can before it turns into a Brown Block. Watch out for the Pokey that approaches from the right.
Then go to the right and go down the pipe.
Go to the left and ignore the red Koopa Shell for now. Jump on the Block to avoid hitting the shell. To the left, there is a floating platform with two coins and a Dragon Coin above it. Get those coins but don't let a Floating Mine hit you.
Then, if you're on Yoshi, and you're Fire Mario, jump onto the Block above the red Koopa Shell and press A to hop off of Yoshi without hitting the Koopa Shell with a fireball. Then pick up the red Koopa Shell by holding X or Y when you touch it. Take it to the left and hold Up when you let go of X or Y so that the shell hits the Block up above that has a P Switch on it. Step on the P Switch and go to the right. Red Koopa Troopas will fall onto the platform of Brown Blocks. Get the Dragon Coin that is above the Brown Blocks, then you can try to jump up and get the coins that are floating above, before the P Switch runs out.
Before the P Switch runs out, get back on Yoshi if you hopped off, then go to the right and run across the Brown Block platform. If the P Switch runs out before then, avoid the Cheep Cheeps in the water, then jump up out of the water onto the Mushroom Platform on the right.
Next, there are two floating platforms, with three coins above them, but there are also two Floating Mines that float past in the water.
To the right of that, there are three floating platforms and several Floating Mines that go past.
Then there is a Mushroom Platform with four coins and a Dragon Coin above it.
After that, there are two floating platforms and two Floating Mines, and three coins above the second floating platform. After that, there is a Cheep Cheep that bounces on the surface of the water.
Go through the pipe on the right.
Hit the Message Block to learn about getting Bonus Stars by cutting the tape in the Giant Gate.
Cut the tape in the Giant Gate to complete the level.
After the Level
If you have enough Bonus Stars, you get to play the Bonus Game, where Roulette Blocks spin around a block with a fixed item in it. Hit the Roulette Blocks to stop them on the item that they are displaying. Try to get three in a row of the same type. For each three-in-a-row, you get a 1-Up Mushroom.
The path to the north will be unlocked, so you can go to #1 Iggy's Castle.