Whoa Zone

 The Whoa Zone is the final area in World 4. It's a giant maze that consists of flipping to 3D and 2D and gravity flips. The final boss of this area is Mr. L and the Brobot.

Story
Warning: Spoilers May Follow.

After floating and walking through space and planets, Mario and his friends follow Squig to the Whoa Zone, a gigantic space maze. Mario must traverse through a maze where he has to step on platform to make the gravity change, so he can walk on the walls and ceiling. When you reach the end, a man jumps out into the screen. He calls himself "Mr. L". After defeating him, he calls over a robot that looks like his face. It's called the Brobot. Squig then turns his body into a shooter that shoots laser balls. Mr. L and the Brobot then break the screen, and your back in space. This also changes the boss battle into a scrolling shooter. After beating him and the Brobot, the screen turns back to the Whoa Zone, but is in an inacceible plac, showing a alien that looks like Squig. That's when Squig finds out that he is a prince, born to help the chosen one. After finding out, he gives Mario the fourth Pure Heart.