Star Coin 1 - Early on in the level you will come to a group of 2 spinning stars. To the right will be a flying koopa troopa and just above it - the first star
Frosted Glacier-Castle Wendy's Shifting Castle - New Super Mario U Guide - IGN
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Walkthrough - New Super Mario U Guide - IGN
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Frosted Glacier-2 Cooligan Fields - New Super Mario U Guide - IGN
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Frosted Glacier-1 Spinning Star Sky - New Super Mario U Guide - IGN
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Frosted Glacier-Castle Wendy's Shifting Castle - New Super Mario U Guide - IGN
New Super Mario Bros. U - Spinning Star Sky (Star Coins)