The Mighty Cannonship
From the Super Mario Wiki
The Mighty Cannonship, or Soda Jungle-Airship, is the first airship level as well as the first level of Soda Jungle in New Super Mario Bros. U. This course is unlocked via completing Larry's Torpedo Castle or Wendy's Shifting Castle and its own completion unlocks Jungle of the Giants. However, completing Blooper's Secret Lair or Piranha Plants on Ice involves skipping The Mighty Cannonship entirely.
Bowser Jr. comes down with the Airship and snatches up the player at the beginning of the level. The first part of the level is on the deck where Cannons and Mechakoopas appear as obstacles to Mario. After that, the player enters a pipe that takes them into a flooded section of the ship filled with Targeting Teds and Mecha Cheeps. When the player reaches Bowser Jr., his Junior Clown Car is in submarine mode. He launches Targeting Teds at Mario while the pipes from the ceiling activate periodically and push Mario down. The player must guide the Targeting Teds to hit Bowser Jr.'s submarine. After three hits, Bowser Jr. falls off stage, and the room drains itself. However, Bowser Jr. comes back and tries to use the Mecha Hand to smash Mario, but Mario jumps out of the way and continues into Soda Jungle.
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