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Star Coin 3: After the checkpoint, you’ll come to a series of ledges where one, then two, then three Monty Moles attack you. Take the pipe to a secret room where you’ll see the Star Coin hovering over a bunch of Piranha Plants - hopefully you’ve still got Yoshi to flutter over them.
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Ground pound them to break through to a hidden tunnel that leads to a pipe. Star Coin 2: You’ll see what looks like two bricks embedded in the ground. It’s too high for you to reach it alone, so use Yoshi’s flutter jump to snag it.
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Star Coin 1: You’ll see the first Star Coin right after you hit the first coin block that contains Yoshi’s egg. It’s above you, but when you jump down you’ll find a pipe that will shoot you up to get it - and bypass some cogs. From there, jump up and right again, and you’ll find yourself in a hidden tunnel that leads to the final Star Coin. Star Coin 3: After the spot where you have to squeeze between three fast-moving cogs, jump up and to the right to find a small ledge. (It’s at the center of the spinning wheel of coins.) You can reach it with a spin jump off the cog or using a hidden coin brick to get across. Star Coin 2: The second Star Coin is below and to the left of the small cog that holds this level’s red coin challenge. When it’s visible, wall jump up the shaft to reach it. Star Coin 1: After you climb the first cog and jump onto the ledge above it, look up to see the first Star Coin in a shaft above you - it’ll be alternately hidden and revealed with a rising stone block. Ground pound the floor next to the sign to move the crystals, access the pipe, and collect the final Star Coin of the level. Star Coin 3: Just after you finish the red coin challenge, you’ll see a pipe blocked off by a crystal - but there’s also a sign with a down arrow.
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Jump in the pipe, and it will turn into a cannon and shoot you directly through a bunch of coins and the Star Coin. Climb up the vine, and you’ll see a pipe. It’ll hit a brick near the bottom, which will grow into a vine. Star Coin 2: A little bit after the checkpoint, you’ll encounter a red Koopa Troopa - don’t hit it with a fireball! Knock it out, and send the shell to the right side of the screen. When you slide down a long slope full of Goombas and coins, there’s a jump at the end that will take you sailing right through the Star Coin. Star Coin 1: This one is right on your path.
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