Mario Kart DS/Airship Fortress
Airship Fortress is the final track in the Star Cup and the twelfth track to appear in the Nitro Grand Prix. The track takes place in a barrage of beaten up airships (probably belonging to Bowser). This track is the only track where Bullet Bills are fired at your kart. This track is from medium-hard to hard, and may take a few trial runs to fully master this track.
The first hazards to appear are the Bullet Bills being fired at you. Hitting one of these will bowl your cart over. Rocky Wrenches, flame showers and edges without barriers are other hazards. You can also drop items if hit by Bullet Bills, but only after the second lap.
There are no shortcuts, however there is a blast cannon which allows you to go at super speed, which is very similar to the pinball launcher in Waluigi Pinball.