Difficulty select:
Press B, C(2), B, C(2), B,
C(2), then hold L and press C(2) at the title screen.
Bonus plane:
Complete the game in extra
mode under the normal or higher difficulty level. Then, press Down at the plane
selection screen to access the black proto fighter.
Jets:
Complete Extra mode with the
indicated jet to unlock the corresponding bonus jet. Press Down at the fighter
selection screen to access the new jets.
Proto SIF : Complete Extra mode with the SIF .
Seylen-II: Complete Extra mode
with the Seylen-EX.
Silph-Assault Jet: Complete
Extra mode with the Silph-II.
Valkyrie-II: Complete Extra
mode with the Mega Valkyrie.
