Bowser Castle 3 is the fourth course in the Star Cup in Super Mario Kart. It's the original game's infamous track, the "noob filter", which is difficult enough to only let mature and experienced players pass through in 100cc Grand Prix Mode. Not only are the racers quite hard to catch upon, but also and above all, the track itself: A nightmare! Multiple walls, jumps above lava, sharp turns and thin corridors prevent unconfirmed players from breaching it's ranks in 100cc Grand Prix, and therefore continue towards the Special Cup.