Press and hold Select & Start and press Reset. If done right, you will be invincible.
During gameplay, take damage to both left and right wings. Do this three times and you should see a secret message on the game over screen.
Destroy a floating battleship just before it disappears in the horizon and you will see flying dirigible. Shoot it for a reward.
Destroy two air fortresses in a row to destroy all the planes in the sky as well as see a falling satellite - you can shoot it for a reward.
Contributed By: KeyBlade999.
During the night phase, destroy the distant enemy ship in the horizon at the same time it appears, and you will see a floating yacht. Shoot it for a reward.
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