Refill ammunition and health
Pause game play, then press [L1]x2, [L2]x2,
[L1], [R1], [L1], [R1], [R2], [R1].
Note your level will be penalized each time this code is activated.
Note: This does not make the Jehuty invincible.
Versus mode
Press [Circle], [X], [Right], [Left],
[Right], [Left], [Down]x2, [Up]x2 at the
"Press Start" screen. A sound will confirm correct code
entry. Alternately, successfully complete single player mode under
any difficulty setting. Complete the game a second time under
any difficulty setting to unlock two more stages.
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.
Toget the alternate ending easily, play the game in easy mode.
Once you get to the final mission, just explode all bombs except
for one or two. After that, you will hear the second ending song
called "A Light With The Name Of Hope".