Dark Koopas are purple-shelled Koopas that live in dark places underground. They are found in Toad Town Tunnels in Paper Mario, where they sometimes grin and start to spin around when they attack, making their opponents dizzy. Dark Koopas are also found in the Pit of 100 Trials in Paper Mario: The Thousand-Year Door, but in this game, they do not cause dizziness. Instead, they are merely stronger than regular Koopa Troopas and have the ability to right themselves after being flipped on their backs.