This Airship is where Princess Peach is being held. Bowser Jr. will give all he has got to stop Mairo.
The level begins near some crates, as well as a screw that moves a Screwtop Platform blocking the path when the player spins on it. Two Mechakoopas also come from a Screwtop Platform above. A section of Cannons firing Cannonball follows. More crates, as well as a Cannons that fires giant cannonballs, are followed by a few more Cannons. More crates and Mechakoopas are found, along with three Cannons firing giant cannonballs. A Screwtop Lift is found, along with a Cannon firing giant cannonballs. After that, there is a Warp Pipe along with three rotating Cannons, leading the player to the next area. A screw is used to lower hanging platforms, followed by another screw that controls Screwtop Platforms. A Warp Pipe leads the player to the next section of the level.
A screw that controls coins is found, along with a Mechakoopa. A Red Ring is found, along with another screw that controls a metal platform. Another Screwtop Lift is found, with a Screwtop Platform also controlled by a screw in the way. The midway point then follows. Yet another Screwtop Lift is found, leading to a platform with a Mechakoopa on it. A screw that controls a large section of Screwtop Platforms, with some crates, a Mechakoopa, and the Warp Pipe leading to Bowser Jr. are found at the end.
In the end, there is the last battle against Bowser Jr., whose defeat provides access to World 8-, the site of the final showdown against Bowser. During the fight, Bowser Jr. prepares to fight with his broken Junior Clown Car, but uses Bowser's Koopa Clown Car instead. He attacks Mario with fireballs and spiked bombs, which can be used to defeat him by Ground Pounding the ground. After the second hit, the Koopa Clown Car begins releasing larger bombs. After the third hit with a Giant Spiked Ball, Bowser Jr. is defeated.
- Mechakoopas- 13
- Cannonballs- Infinite
- Cannons- 25 (17 small, 12 together in 3 groups; 8 big, 3 together)
- Bowser Jr. (boss)
- Star Coin 1: The first Star Coin is floating high up in the air in the area with several cannons. To obtain it, Mario and co. can either fly up to it with a Propeller Suit, or jump up to it with the cannonballs or a well-timed triple jump.
- Star Coin 2: Just after the midway point are two platforms with two Mechakoopas and the second Star Coin trapped inside. Mario and co. must ride the nearby Screwtop Lift under them and subsequently jump at the right time to get it without touching a Mechakoopa.
- Star Coin 3: A Propeller Suit is required for this one. Soon after the second Star Coin, there is a lone screw. Mario and co. must spin on it to make the third Star Coin emerge from under the nearby platform, jump to it, and activate the Propeller Suit to fly to safety before falling.