All instant action levels:
     Press (Up) (Down) (Left) (Right) JLJL at the menu with "Continue"
and  "New  Game"  options.  The  phrase "Secret code accepted" will be
spoken to confirm correct code entry.

Big heads:
     Press  (Right)  (Up)  (Left)  (Down)  (Right)  (Up) (Left) (Down)
(Right)  JLJL  at the menu with "Continue" and "New Game" options. The
phrase  "Secret  code accepted" will be spoken to confirm correct code
entry.

TIE Fighter:
     Successfully  complete  all  campaign  and  challenge missions to
unlock the TIE Fighter in Instant Action mode.

Unlimited ammunition:
     Press (Up) (Right) (Down) (Left) (Up) (Right) (Down) (Left) JL at
the  menu  with  "Continue" and "New Game" options. The phrase "Secret
code  accepted" will be spoken to confirm correct code entry. When you
fire  your  weapons,  the  current  number  of  rounds  remaining will
increase to 9999.

Unlock Star Wars vehicles
     Complete the Secret Weapons Over Normandy 15-mission campaign and
all  21  Challenge missions. If you do well enough you will unlock the
tie fighter and x-wing craft from Star Wars.

X-Wing:
Successfully complete all campaign and challenge missions to unlock the
X-Wing in Instant Action mode.