Giga Wing 2 Codes -

Cheat mode:
Enter the gallery and quickly press Up, X, Y, X, Down, Y, X, Y(2) on the first screen. All planes, gallery entries, and two bonus options will be unlocked.

Bonus levels:
Successfully complete the game in arcade mode to unlock more levels in score attack mode.

Bonus planes:
To unlock all five of the original planes from Giga Wing, successfully complete the game under any difficulty setting with each character without continuing. The character you complete the game with will determine the plane that is unlocked. Complete it with Kart to unlock the Raijin, Romi to unlock the Purchka, Ralugo to unlock the Widerstand, Limi to unlock the Stranger, and Chery to unlock the Carmine.