Bowser Castle, the Nintendo DS version, is one of the treacherous fortresses of Bowser, refurbished into a Mario Kart racetrack. The obstacles in this castle are more mechanized than previous incarnations. Sure, Thwomps still pound through the hallways, but there's a lot of moving metallic platforms and bridges trying to throw you off course (literally) and into lava. Being a more difficult track to conquer, Bowser Castle is the penultimate course of the Special Cup, right before Rainbow Road (DS).