A large throne area has been added near the bottom section of the course, though players cannot reach it. Though it is visually fashioned after the aesthetic of GBA Bowser's Castle 1 instead of keeping its original visuals, the castle is now depicted as ruined, with the castle situated within a lava lake bordered by two volcanoes, and the lava inside the castle now flows into a large chasm in the middle. Twenty-two years elapsed before this course received its first reappearance, the longest time period out of any course in the series so far, beating GBA Yoshi Desert by nearly a month. Overall there are eight (a group of three, two, a lone one and another pair) item boxes on this course.īowser's Castle 4 makes its classic course debut in Mario Kart Tour, starting with the 2023 Bowser Tour, making this the first Special Cup course from Mario Kart: Super Circuit to return in another Mario Kart game. There is another left turn, two right turns and a final U-turn (with two Thwomps right in the middle of it) before the finish line is reached. The subsequent right-left turn has several Mechakoopas before the upcoming left turn. Afterwards there are two more right turns, another split path filled with jumps, followed by a larger jump over an earlier portion of the track. After another right turn the player is given the choice to take the right, narrow and (due to the boost panels) speedier route forwards or the left, wide and slower route forwards. This ends with a left turn, three right turns (with Thwomps near the last) and a left turn that leads into a thinner pathway. Initially, there is a left-right turn followed by two normal left turns, after which there is a long, wide stretch of ground littered with square pools of lava that let out Lava Bubbles. This course makes its classic course debut in Mario Kart Tour as part of the 2023 Bowser Tour. Unlike most stages with Thwomps, some of the Thwomps on this stage are capable of moving horizontally, moving further down the track and back at regular intervals before slamming down. What appears to be a large generator with Bowser's emblem on it can be seen in the background. This course features many dangerous jumps over lava pits, several Thwomps blocking the way, and Mechakoopas at the end of the race.

It is the longest course in the game and shares its music with the game's other three Bowser Castles ( Bowser Castle 1, Bowser Castle 2, and Bowser Castle 3). It is the first Bowser's Castle course to appear as the third course of the Special Cup before Rainbow Road, a trait that would later be shared by every new Bowser's Castle course in future main-series installments. Bowser's Castle 4 (known as Bowser Castle 4 prior to Mario Kart Tour) is the third course of the Special Cup in Mario Kart: Super Circuit.

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