Dreadnought's Colossal Cannons
From the Super Mario Wiki
The player starts on a platform next to a Bolt Lift that will turn and move as the player stands on it. Afterward is a large hill with Flipswitch Panels, and many Mini Wanwan will be rolling down the hill. While avoiding the Mini Wanwan, the player needs to activate all of the Flipwsitches to the green "on" position, and doing so will remove all the Electric Fences and defeat the Mini Wanwans. Next, the player has to move between more large, rotating bolts and defeat two Octopodes to lower a bridge to a Launch Star, which will send the player to an area along the side of the Dreadnought.
In this area, many cannonballs are being fired from the Dreadnought, and stepping onto a platform will make it start moving. Avoiding the enemies and obstacles, the player has to move from platform to platform to reach the end, with some platforms changing the flow of gravity when the player jumps at them. Above one of the Jump Beamers at the end is the Power Star.
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