• Unlimited Lives
On the password screen, jot in:
JPVI?IJC
Make sure you get it right, because there will not be a confirm sound. Then type in:
RSBFNRL
And you will have unlimited lives. Your life counter will still show three, but it will not decrease no matter how bad you crash your ship.

• More Passcodes
THATSME! : Unlock Credits
?INSIDER : Unlock Documentary
EXHIBIT! : Unlock Art Gallery
Passcodes for Naboo Starfighter and Millenium Falcon
Both of these codes are two-parters. The first code will have no confirmation sound, but is necessary in order for the second code to work.
Naboo Starfighter:
Code 1: CDYXF!?Q
Code 2: ASEPONE!
Millenium Falcon:
Code 1: MVPQIU?A
Code 2: OH!BUDDY

• TIE Fighter and level Passcodes
TIE Fighter:
Code 1: ZT?!RGBA
Code 2: DISPSBLE
All 10 basic missions unlocked:
Code 1: !??QWTTJ
Code 2: CLASSIC (the last space is blank)
Death Star Escape Unlocked:
Code 1: PYST?OOO
Code 2: DUCKSHOT