Cheat mode:
For the following codes, select the "Codenames" option at the main menu. Select your character, then enter one of the following codes at the "Secret Unlocks" screen. Save your Codename after entering the code. Then, exit your Codename and begin game play.

Code - Result:

PASSPORT - Level Select
TRANSMIT - Uplink Mode
GUARDIAN - Protection Mode
POWDER - Unlock Alpine Escape level
MELTDOWN - Unlock Alpine Escape level
BLASTOFF - Unlock Countdown level
AQUA - Unlock Deep Descent level
BONSAI - Unlock Double Cross level
TRACTION - Unlock Enemies Vanquished level
PARADISE - Unlock Island Infiltration level
HIGHRISE - Unlock Nightshift level
FLAME - Unlock Phoenix Fire level
Q LAB - All gadget upgrades
SHUTTER - Camera upgrade
SESAME - Decrypter upgrade
P2000 - P2K upgrade
AU P2K - Golden P2K
AU PP7 - Golden PP7
LIFTOFF - Grapple upgrade
PHOTON - Laser upgrade
ZAP - Stunner upgrade
GAMEROOM - All multi-player options
TNT - Demolition Mode
VACUUM - Unlock the Equinox Level
BOOM - Explosive Scenery in MP
TEAMWORK - Team King of the Hill in MP
SCOPE - Assassination Mode in MP
ORBIT - Goldeneye Strike in MP
BOWLER - Unlock Oddjob in MP
NUCLEAR - Unlock Christmas Jones in MP
MIDAS - Unlock Goldfinger in MP
CIRCUS - Unlock Miss Galore in MP
ASSASSIN - Unlock Scaramanga in MP
DENTAL - Unlock Jaws in MP
BLACKTIE - Unlock Tuxedo in MP
VOODOO - Unlock Baron Samedi in MP
MAGAZINE - Unknown
JANUS - Unlock Xenia in MP
BLIMP - Unlock Max Zorin in MP

Drive Shelby Cobra:
On the Enemies Vanquished level, press Start to pause the game. Then hold L and press Right, Right, Left, Left, Up and release L. You can now drive the Shelby Cobra through the Alps and beat the enemy car.

Bonus race in Alps:
While racing on the Enemies Vanquished level, press Start to pause game play, then hold L and press B(2), X(2), Y, then release L.

Frantic racing:
While racing on the Paris Prelude, Enemies Vanquished, Island Infiltration, or Deep Descent level, press Start to pause game play, then hold L and press X, Y, B, Y, X, then release L.

Berserk racing:
While racing on the Paris Prelude, Enemies Vanquished, Island Infiltration, or Deep Descent level, press Start to pause game play, then hold L and press X, Y(2), X, Y, B, then release L.

Trails during racing:
While racing on the Paris Prelude, Enemies Vanquished, Island Infiltration, or Deep Descent level, press Start to pause game play, then hold L and press X, B(2), X, then release L.

Double armor during racing:
While racing on the Paris Prelude, Enemies Vanquished, Island Infiltration, or Deep Descent level, press Start to pause game play, then hold L and press B, Y, X, B(2), then release L.

Triple armor during racing:
While racing on the Paris Prelude, Enemies Vanquished, Island Infiltration, or Deep Descent level, press Start to pause game play, then hold L and press B, Y, X, B(3), then release L.

Quadruple armor during racing:
While racing on the Paris Prelude, Enemies Vanquished, Island Infiltration, or Deep Descent level, press Start to pause game play, then hold L and press B, Y, X, B(4), then release L.

Super bullets during racing:
While racing on the Paris Prelude, Enemies Vanquished, Island Infiltration, or Deep Descent level, press Start to pause game play, then hold L and press B(4), then release L. Note: This can also be done when you are flying the plane with Alura.

Faster game play:
Press Start to pause game play, then hold L and press X, Y, B, White, X, Y, B, White, then release L.