Mecha-Koopas are, as the name implies, mechanic Koopas, with a wind-up key on their back. They belong to the Super Mario series, and the Koopa Troop. They attack by chasing the player, and, in the manner of Bowser, by spiting fire. If Mario jumps on a Mecha-Koopa, the Mecha-Koopa will be paralyzed, and become a object Mario can throw. He will explode after a short time, like a Bob-omb.