Mechawiggler Escape
Mechawiggler Escape is a glitch that allows Mario to escape from the Mechawiggler arena in the Metro Kingdom while the battle is ongoing. The arena is exited by hopping onto a scooter that is inside one of the walls bordering the arena, which must be strategically placed before the battle begins.
Execution
To begin with, a scooter must be placed in the location where one of the arena walls will later spawn. Since there is normally no way to reach the top of the skyscraper to activate the boss fight without the scooter despawning (the scooter despawns after a certain amount of time or when a loading zone is entered), one must use two-player mode to prepare a capture warp by leaving Cappy near a spark pylon at the top of the building. This way, Cappy can simply touch the spark pylon once Mario is finished placing the scooter, causing Mario to be warped to the top.
It is to be noted that Cappy must be within view of the camera in order for the capture to be successful.
Once the boss fight is initiated, all one must do is mount the scooter, which should be halfway inside the wall. This will allow the player to drive forward through the wall and explore the rest of the kingdom.