A Dark Koopa is an enemy that appears in Super Paper Mario.
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Dark Koopas are darker, stronger versions of Koopa Troopas that are only found in the Flopside Pit of 100 Trials. These Koopas are hard to tell the difference from the green shelled Koopas or the red shelled Koopas so caution around them is needed. They only walk around in the areas they are end, just like with the regular Koopas.