This star is on top of a stack of Goombas. To get it, try using the Cannon Box from the second group of ? Blocks right at the start of the level. There's a Mega Mushroom in an invisible block between ...
IGN's Guide to finding every green star and stamp in Super Mario 3D World. This 100% walkthrough video shows where to find every collectible in World 3-Boss: The Bullet Bill Express.
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