A purple block after the halfway point flag leads to a room with two Koopas. Kill the Koopas to reveal the Green Star. After you blast through the long clear pipe, jump on the ? blocks to discover ...
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 1-2: Koopa Troopa Cave.
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