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In Chapter 3-1, an ordinary Koopa Troopa saw Mario coming, so it ran for its life and hit a block containing the Mega Star and turned huge (using the same animations that any other character does when he or she uses a Mega Star). Mario or Princess Peach (Bowser and Luigi can also encounter it once they join the party later on) need to become giant by using a Mega Star to defeat the Koopa, but it can also be defeated by an explosion of Boomer, Bowser's fire breath, Luigi's Super Jump, picking it up and throwing with Thoreau, protection barriers by Barry, succumbing to the effects of a Catch Card SP or Items. If the player picks up the Mega Koopa it will hide in its shell and can be kicked before it gets out. Oddly enough, when looked at in 3D, the Mega Koopa is 3D instead of flat.
When the player receives 100 shop points, they are given a Catch Card of the Mega Koopa.
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