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Versus mode
Successfully complete the game on any difficulty setting to unlock versus mode with five frames and most stages. Successfully complete the game on any difficulty setting twice to unlock the remaining two frames and stages.
Alternate ending music
Successfully complete the game on any difficulty setting and get an "A" rank on all five rescue missions to hear a different ending theme during the end credits.
Full health and ammunition
Pause the game and press L1(2), L2(2), L1, R1, L1, R1, R2, R1. Note: Each time this code is used your level will go down by one.
Disco mode
At the title screen, press Up, Down(2), X, Triangle, Left, Right, Square. If you entered the code correctly you will hear the sound of an explosion. In this mode, all enemies will be replaced by giant floating disco balls and the screen will flash all different colors. Successfully complete the game in this mode to receive a special surprise.
Unlock extra options:
Complete the game on any difficulty level with rank D or above to enable the versus option on the main menu.
Complete the game a second time to unlock the remaining two orbital frames and two battle levels in versus mode.
Complete the game 50 times on one player versus mode to get Anubis as a playable frame.
Alternate ending sequences:
Earn an "A: rank in all S.O.S. calls. New music will play during the ending sequence. Intentionally do badly during the game by destroying all buildings and killing all survivors during the various missions. This includes completely destroying the colony shaft during the last SOS mission. Defeat Tyrant and go to the Mountain 1 level to view the worst ending.
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