Blue Shell

''This article is about the normal Koopa Troopa shell. For the blue version of the Spiny Shell which appears as a Mario Kart item, see Spiny Shell (blue).Blue Shells, also known as Blue Koopa Shells, are blue Koopa Troopa shells that first appear in Super Mario World''. While occasionally worn by Koopa Troopas, they are more prevalent as items that Mario or Luigi can use.

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