Yes, this is the final level of the entire game! And of course, it features you against Bowser. Let's go! Enter the castle at the start and continue north until you reach another door. Open it up, and ...

Hop through the Middle Ring and grab the Red Coin on the right. Ride the platform to the inside of the castle. Now in the main room, enter one of the four doors. Each room has a single key that you ...