It's buried beneath a stack of blocks, only a few of which are destructible.

Star Coin 2: Just past the first Star Coin is the second treasure. You can jump on top of the nearby bricks to reach it, wall jump off of the closer brick formation, or clear all the bricks and simply get a running jump to the ledge. Star Coin 1: The first Star Coin comes early in the level and is in plain sight. Gathering all of the coins should be a cinch. Climb the vine and you'll enter a cloud area with the Red Ring. Jump on top of the newly-formed blocks and bust the block overhead to reveal a green vine. Jump up at the center of the gap and you should uncover some invisible blocks. Red Coins: Immediately after grabbing the first Star Coin, look for a mid-air block formation with a gap in the bottom row. As Super Mario (or better), jump and perform a ground pound (hold DOWN in mid-air) to smash through the bricks and grab the coin. You should be able to easily spot the coin under a row of bricks. Star Coin 3: If you've just come out of the tube where you grabbed the second Star Coin, turn around and backtrack a bit to find the third coin. At the far end of the underground area is the second Star Coin. Star Coin 2: Just after you hit the halfway checkpoint, look for a green tube that'll let you go underground. It's in plain sight and can be grabbed simply by jumping off the row of bricks to the left. Star Coin 1: The first Star Coin is found just before the halfway point on the map.

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