Infiltrate Bowser's Castle!
From the Super Mario Wiki, the Mario encyclopedia
The mission begins at the Odyssey, near the entrance to Bowser's Castle. After crossing ten Goombas, Mario must capture a spark pylon to go to the next area. He must then capture a Pokio and use it to climb up the wall, evading the Spinies along the way. After capturing another spark pylon, Mario must pass more Spinies and head to his right, and subsequently defeat the Stairface Ogre, allowing him to collect the Power Moon.
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