Star koopa-troopa

As you can see, they have rainbow-colored shells and emit sparkles.

This Koopa Troopa is the result of a Power-up Koopa Troopa touching a star. It is invincible for a short period of time, so if you try jumping on it's head while it's shell is turning rainbow colors, you'll die instantly. Also, keep in mind that these Koopa Troopas can run instead of walk, so your best bet is to run away from them until their star wears out. After that, it is safe to bop them on the head.

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