From the Super Mario Wiki
Meowser Showdown! is the final course in Super Mario Maker 2's Story Mode. It is unlocked when the Chief gets kidnapped. The course is set in a castle theme, and has a difficulty rating of 3/4 stars. Once the course is cleared, the Chief will return and the castle will be complete, and the player will also unlock the Super Hammer.
At the first section, there is a giant ! Block that rises when Ground Pounded, giving Mario access to a ? Block containing a Super Mushroom. Another giant ! Block will extend to the right when Ground Pounded, leading Mario to a Fire Bro guarding the next ! Block. After Ground Pounding the ! Block, Mario will encounter a Heavy Fire Bro, and a gap with lava. After jumping over the gap, there are two ? Blocks: one contains a Super Mushroom, while the other contains Coins. Ground Pounding the next ! Block leads Mario to a Bully, and another ! Block. More ! Blocks will lead Mario to a giant Meowser; once Mario is past Meowser, he must jump onto a Semisolid Platform to find a Hop-Chops on the ground. There are more Semisolid Platforms that leads Mario to a Clear Pipe, which in turn leads to the Checkpoint Flag. A red Warp Pipe will lead Mario to an area with a Koopa Troopa Car, and Mario must avoid lots of obstacles while driving to a Warp Box. A Clear Pipe will then take Mario to another Checkpoint Flag, and a giant winged Meowser. After reaching the top of the area via Clear Pipe, Mario must face Meowser head-on using Red POW Blocks. After defeating Meowser, Mario will receive a Key and enter a Warp Box to reach the Goal Pole and rescue Toadette.
"THIS. IS. TERRIBLE! The Chief has been abducted by Bowser! We'll never be able to complete the castle without her! Please help us, Mario!"
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