Full Health and Ammo:
Pause the game, the press L1, L1, L2, L2, L1, R1, L1, R1, R2,
R1
Note: Your level will go down once each time you do this.
Unlock Disco Mode:
At the Options screen, press Up, Down, Down, X, Triangle, Left,
Right, Square. If you play through the game in this mode you will get
a suprise at the end.
Unlock Versus mode:
At the title screen, press Circle, X, Right, Left, Right, Left,
Down, Down, Up, Up
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.