DREAMCAST CHEATS (Giga Wing)
Play as Stranger
Enter the Gallery section and press B, X, Y, B(2), Y, X, B at the first screen. If you entered the code correctly, you will hear a sound. Alternately, successfully complete the game on any difficulty setting without using any continues.
Invincibility for player two
Select two player mode, and have player one select a jet. Then, press Start + A on controller two when selecting a jet for player two.