Summit Path

Walkthrough: After grabbing the Power Moon, head to the top to find more Purple Coins along the ridge. From there, head up some more to find Binoculars that will let you see your next foe at the top of a very steep slope. It's too steep to climb, so use Cappy to collect the Boost Flowers at the base to give Mario enough speed to scale the slope and reach the top of the summit. The more flowers collected, the faster Mario will run.

Continue up the long path at the summit to reach another field with exactly three Sherms. There will be a device at the very end that is shooting out explosive spheres down the slope, which will head right for Mario and Cappy. Quickly capture one of the three Sherms, earning a Life-Up Heart by breaking some blocks around the corner. From there, carefully proceed to the hilly field, and then blast away the spheres using the power of the Sherm.

Once you get close enough to the other side of the field, begin strafing from side to side, aiming your cannon at the four Bowser icons that are circling the device launching the spheres. You will have to be careful as you do this, as more and more spheres will be launched while you try to cannon these icons. It works best if you try to hit one icon, and then quickly try to blast away the spheres closing in. Alternate using this method to quickly destroy the machine, and then claim your Power Moon reward for doing so.