Cheat Mode (U.S. version):
Highlight 'Options' at the Main Menu, then press Triangle, Circle, Left, L1, R2, Square, Circle, Left. You'll hear a beep to confirm. Now hold L1 + Select + Triangle to bring up a debug menu.

Cheat Mode (Japanese version):
At the title screen, hold L1 + Select and press Triangle. This will enable a cheat menu with invincibility and level select.

GameShark Codes

Press [Select] At Title Screen- d00862680100
for Cheat Menu- 800b3a500004

Invincibility- 800b69440001

Infinite Ammo- 8004e0362400

Max Force- 800b829c1000

Have All Items- 800b7b72ffff
800b7b74ffff
800b7b76ffff

Stop Game Timer- 800b40960000

Infinite Health Obi Wan- 800b84900064

Light Saber Obi Wan- 800b84a40001

Blaster Obi Wa-n 800b84a803e7

Light Repeating Blaster Obi Wan- 800b84ac03e7

Proton Missle Launcher Obi Wan- 800b84b003e7

Thermal Detonators Obi Wan- 800b84b403e7

Gungan Energy Balls Obi Wan- 800b84b803e7

Flash Grenades Obi Wan- 800b84bc03e7

Droid Stunner Obi Wan- 800b84c40001

R-65 Heavy Blaster Obi Wan- 800b84c803e7

Naboo Blaster Obi Wan- 800b84cc03e7

Infinite Health Qui-Gon- 800b84dc0064

Light Saber Qui-Gon- 800b84f00001

Blaster Qui-Gon- 800b84f403e7

Light Repeating Blaster Qui-Gon- 800b84f803e7

Proton Missle Launcher Qui-Gon- 800b84fc03e7

Thermal Detonators Qui-Gon- 800b850003e7

Gungan Energy Balls Qui-Gon- 800b850403e7

Flash Grenades Qui-Gon- 800b850803e7

Droid Stunner Qui-Gon- 800b85100001

R-65 Heavy Blaster Qui-Gon- 800b851403e7

Naboo Blaster Qui-Gon- 800b851803e7

Infinite Health Panaka- 800b85280064

Light Saber Panaka- 800b853c0001

Blaster Panaka- 800b854003e7

Light Repeating Blaster Panaka- 800b854403e7

Proton Missle Launcher Panaka- 800b854803e7

Thermal Detonators Panaka- 800b854c03e7

Gungan Energy Balls Panaka- 800b855003e7

Flash Grenades Panaka- 800b855403e7

Droid Stunner Panaka- 800b855c0001

R-65 Heavy Blaster Panaka- 800b856003e7

Naboo Blaster Panaka- 800b856403e7

Infinite Health Queen- 800b85740064

Light Saber Queen- 800b85880001

Blaster Queen- 800b858c03e7

Light Repeating Blaster Queen- 800b859003e7

Proton Missle Launcher Queen- 800b859403e7

Thermal Detonators Queen- 800b859803e7

Gungan Energy Balls Queen- 800b859c03e7

Flash Grenades Queen- 800b85a003e7

Droid Stunner Queen- 800b85a80001

R-65 Heavy Blaster Queen- 800b85ac03e7

Naboo Blaster Queen- 800b85b003e7