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Star Coin 1: To the left of the first light cube.
Star Coin 2: Surrounded by bloopers, push the ? button to release them all.
Star Coin 3: Under the last green pipe before the exit.
Star Coin 1: Near the beginning.
Star Coin 2: Right of the checkpoint, pick a bob-omb and throw it to the coin.
Star Coin 3: At the crow section, jump before the platform falls.
Star Coin 1: Use the spring or the helicopter to reach it. You can use wall jump too.
Star Coin 2: Use the ? switch to turn the coins to blocks to reach it using wall jump. Works with helicopter and normal wall jump too.
Star Coin 3: Near the end, use the helicopter or the platform.
Take in mind you must reach the end of the stage as Helicopter Mario. THERE AREN'T ANY ITEMS FOR THIS.
Star Coin 1: Surrounded by cannons, jump on the balls to reach it. Or use helicopter.
Star Coin 2: After the checkpoint.
Star Coin 3: As you reach the end, spin on the last screw to make it appear. Jump, and then use helicopter to recover.