Extra colors for jets
When selecting your player, instead of pressing just the A button, press either X+A or Y+A simultaneously to get two extra alternate colors.
Contributed By: Ryu Hayabusa.
Invicibility for Player 2
Choose the Two Player mode, have Player 1 pick a jet. Then hold Start and press A on the second controller when picking a jet for player 2.
Player 2 will be invincible for the whole game.
Contributed By: Fatal Zapper.
Unlock All Gallery Images and Stranger
From the main menu, select Gallery and press:
B, X, Y, B, B, Y, X, B
You'll hear a sound effect if done correctly, and when a new game is started, you'll find a brand new ship available.
Contributed By: KasketDarkfyre.
Good Endings for Giga Wing
Get to the Final Stage (stage 7) on 1 credit to view the ''Good'' ending for your character upon completion. Note that you do not need to completely finish the game on that 1 credit after you make it to Stage 7.
Unlockable How to Unlock Good Ending for each character Get to Stage 7 within 1 credit, then simply finish the game.
Contributed By: Warming Blasters.
Unlockable How to Unlock Unlock stranger Finish the game in any difficulty level, without using any continues
Contributed By: Mykas0.