Boarding the Airship
From the Super Mario Wiki
Boarding the Airship, or Meringue Clouds-Airship, is the final course of Meringue Clouds in New Super Mario Bros. U. Just like in The Mighty Cannonship (All Aboard! in New Super Luigi U) before it, the course is not seen until the player reaches its spot. It is unlocked via completion of Ludwig's Clockwork Castle and its own completion unlocks the path to Meteor Moat.
Unlike the other Airship levels in the Mario franchise, this one takes place outside of the airship, progressing to the boss arena. The first section is similar to the final part of #1 Iggy's Castle in Super Mario World, where a giant object periodically comes down to crush the player. However, unlike #1 Iggy's Castle, Boarding the Airship's object is the Mecha Hand that was used to toss the Mario Bros. and Toads to Acorn Plains. During the later half of the first section, the hand will start punching the ground, destroying it in the process.
After the first Checkpoint Flag, the second section takes place below the hull of the ship, and the player must use a platform that moves when the Wii Remote or Wii U GamePad is tilted while avoiding Rocket Engines. At the end of this section is a yellow Warp Pipe that takes Mario to the second Checkpoint Flag and a Pipe Cannon.
After the second Checkpoint Flag and taking the Pipe Cannon up, the final section is the boss battle with Bowser Jr., in his Junior Clown Car. Unlike before, however, Bowser Jr. equipped his vehicle with boxing gloves, which destroy the steel blocks the player has to stand on, and Bowser Jr. himself tosses Bob-ombs, which the player can use to harm Bowser Jr. After three hits, Bowser Jr. is defeated.
A cutscene plays where the player drops onto the airship, and Bowser Jr. prepares to crush Mario with the Mecha Hand, but he runs out of the way and it punches through the flagship itself, severely damaging it and causing it to crash outside of the tornado ahead.
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