Bowser's Castle: The Last Dash

Bowser's Castle: The Last Dash is an official course in Course World in Super Mario Maker 2. It is the twentieth level of Ninji Speedruns, running from April 13, 2021 to April 27, 2021. It is set in the castle theme for its main area and in the underground theme for its sub area, as well as in the New Super Mario Bros. U game style.

While it was described as the last Ninji Speedruns level, another level was eventually released following it.

Layout
The level begins with a big Zappa Mechakoopa, along with a Spike throwing a Spike Ball to a ? Block containing a Super Mushroom. Mario must use a Swinging Claw to move across to the next area, where two Giant Spiked Balls appear. After another section with two big Zappa Mechakoopas, Mario must ride a Fire Koopa Clown Car or Lakitu's Cloud upwards through a section with Piranha Plants and Frozen Coins. After another section with a few blocks, Mario must kick a Mega Bob-omb into some Hard Blocks blocking a Key Door to proceed. After crouching to pass through a Conveyor Belt, Mario must hit an ON/OFF Switch, then grab a Super Star from a Warp Pipe, go back to the beginning, and take another lap to the ax, blocked by a big Bowser, to complete the level.

If Mario decides to take any of the level's Warp Pipes, he will be brought to a parallel underground section, albeit with most of the Zappa Mechakoopas being replaced with Blasta Mechakoopas and the enemies at the beginning being Wendy and a big Lemmy.

Description
"To clear the final Ninji Speedruns course, you'll need to run a few laps around Bowser's Castle! It's packed with tricky gimmicks that will put all of your skills to the test. Keep at it, and go for the best time you can get!"

Enemies

 * Big Zappa Mechakoopas (4)
 * Big Blasta Mechakoopas (4)
 * Spike (1)
 * Munchers (3)
 * Banzai Bills (2)
 * Big Winged Zappa Mechakoopa (1)
 * Big Winged Blasta Mechakoopa (1)
 * Giant Spiked Balls (2)
 * Big Munchers (3)
 * Mechakoopas (2 in the background)
 * Piranha Plants (24)
 * Mega Bob-ombs (2)
 * Zappa Mechakoopas (2)
 * Blasta Mechakoopas (2)
 * Big Bowser Jr. (1)
 * Big Lemmy (1)
 * Big Wendy (1)
 * Big Bowser (1)