Mecha-Koopas (sometimes spelled Mechakoopas), also called Windup Koopas in the New Super Mario Bros. Wii game guide, are one of Bowser's many minions. They are small mechanical versions of Bowser himself, resembling a wind-up toy. They have a wind-up key on their back and their appearances feature several mechanical appendages. They walk in a rhythmical way and must wind themselves up again from time to time in order to keep moving.