How to clear Donut Secret 1 in Super Mario World for the Super Nintendo Entertainment System and Game Boy Advance.

How to Reach Donut Secret 1
To reach Donut Secret 1, find the secret exit in Donut Plains 1.
How to Clear Donut Secret 1
Swim to the right and there is a Rip Van Fish, which will wake up and start chasing you if you get close, then will eventually fall asleep again.
Get the five coins to the right. There is a Cheep Cheep going up and down after the coins, and a Blurp below that.
Go to the right of where the Blurp was coming from, and get the two coins at the top of the path.
After that, there is a Rip Van Fish below you, and some Prize Blocks to the right, with a Rip Van Fish on top. The third Prize Block contains a Super Mushroom or Fire Flower, and the rest contain coins. Above the Prize Blocks, there is a Dragon Coin.
Below the Prize Blocks, there is a Blurp, and to the right of the Blurp, there is a Cheep Cheep that goes left and right.
Above the Cheep Cheep, there is a pipe. Go up the pipe to reach an underground cave. (If you ignore the pipe, you will go past a Rip Van Fish and two Blurps. Skip the next paragraph.)
Hit the Prize Block to get a Power Balloon, which temporarily turns you into Balloon Mario. You will float up, and you can use the directional pad to float left and right and down. There are coins here, as well as red Koopa Paratroopas to dodge. First, stay in the left half of the screen so you can hit the Prize Block there. It contains another Power Balloon, so take it before you deflate. If you keep going straight up, you will find a Dragon Coin. Go to the right from there and hit the rightmost Block to get a 1-Up Mushroom, then get the Dragon Coin to the right of that. If you fall straight down from there, you land on a platform with a Prize Block that contains a Super Mushroom or Fire Flower. Fall down from that platform and go down the pipe.
There are two Cheep Cheeps that go up and down, four coins in a ditch, and a Dragon Coin in the ditch to the right of that.
Next, there is a Rip Van Fish next to a Prize Block. The Prize Block contains a Super Mushroom or Fire Flower.
After that, there are two Cheep Cheeps that go up and down, followed by a Rip Van Fish next to two Grab Blocks with a Dragon Coin between them. Get rid of the Rip Van Fish and press A to hop off of Yoshi if you're on him, then hold X or Y and touch the Grab Block to pick it up. Take the Dragon Coin.
To the right, there is another Rip Van Fish down below, and two Cheep Cheeps that go left and right, followed by a P Switch. If you want to reach the Secret Exit, step on the P Switch and quickly swim to the right. There will be coins in the shape of an arrow pointing right (along with two Blurps), then another Blurp as you go to the right, a Dragon Coin up above, and a Rip Van Fish. After that, go through the coins before they turn back into Brown Blocks, hit the Prize Block to get a key, and put the key into the keyhole (but watch out for the Blurp). The level will end, and the path to the east will unlock and you can go to the Donut Secret House.
Otherwise, go to the right from the keyhole and you will find two Cheep Cheeps that go left and right. If you go upward from here, there is a hidden Dragon Coin above the wall (unless you are revisiting this level after you already got five Dragon Coins here) and four coins or Brown Blocks on the right (depending on whether or not the P Switch is still in effect). Below that, there is a Cheep Cheep going left and right and a Cheep Cheep going up and down.
After that, there is a Rip Van Fish, and the Giant Gate.
After the Level
If you used the secret exit, the east path will unlock and you can go to Donut Secret House. If you used the Giant Gate to complete the level, the north path will unlock and you can go to Donut Ghost House.