At the "enter secrets" screen in the codename customization menu, enter the code GAMEROOM. a scenarios for multiplayer will be unlocked and playable.
All Players
On the title screen and go to code names. Then go to "secrets unlocked." Enter PARTY and you will get all the characters for multiplayer.
All Upgrades Unlocked
At the "enter secrets" screen in the codename customization menu, enter the code Q LAB (Make sure to include the space). all upgrades for weapons and gadgets will be unlocked for your codename.
Assassination Mode
Enter SCOPE as a code to unlock Assassination Mode.
Pause the game on the Enemies Vanquished level, then hold L and press Right(2), Left(2), Up.
Explosive Scenery
To make the scenery, well, explosive, enter this code: BOOM.
Get Equinox Level
Enter the code VACUUM.
Get Faster Laser
Enter the code PHOTON.
Get SUV
On the Enemies Vanquished level while you are driving pause the game and HOLD L and press B,X,Y,B,Y.
Goldeneye Strike
Put in the code Orbit.
Larger Sniper Rifle Clip
Put in the code MAGAZINE.
Level Select
Enter PASSPORT as a code to unlock all of the levels in the game.
Multiplayer: double K-40's
Choose any weapon choice for multiplayer that has the K-40 in it. Find it and find another or wait for it to come back again and pick it up. In short, find to K-40's. Key: You must be a Phoenix Character.
Protect Mode
Enter GUARDIAN as a code to unlock Protect Mode.
Stronger Missile
Enter the code LAUNCH.
Team King of the Hill Mode
To unlock Team King of the Hill Mode, enter this code: TEAMWORK.
Unlock Countdown Level
Enter the code BLASTOFF.
Unlock Explosive Scenery in Multiplayer
At the "enter secrets" screen in the codename customization menu, enter the code BOOM. Fuel barrels will appear at several points throughout the level as long as the "explosive scenery" option is turned on.
Unlock Golden Gun
Enter the code TARGET.
Unlock Golden P2K
Put in the code Q LAB (Must have the space).
Unlock Max Zorin for Multiplayer
Put in the code BLIMP.
Unlock Renard for Multiplayer
Put in the code HEADCASE. P.S. For all codes that tell you to put in a code, go to options and choose your screen name. Then you go to Secret Unlocks and enter the code.
Unlock Sniper Level
Enter the code MELTDOWN.
Uplink Mode
Enter TRANSMIT as a code to unlock Uplink Mode.
Various Cheat Codes
Get SUV
On the Enemies Vanquished level during racing pause the game and HOLD L and press B, X, Y, B, Y
Get Shelby Cobra
On the Enemies Vanquished level during racing pause the game and HOLD L and press Right, Right, Left, Left, Up
Get Extra Race
On the Enemies Vanquished level during racing pause the game and HOLD L and press X, X, B, B, Y
Get Racing Trails
On any level during racing pause the game and HOLD L and press B, X, X, B
Get 3X Armor
On any level during racing pause the game and HOLD L and press B, Y, X, B, B, B
Get 2X Armor
On any level during racing pause the game and HOLD L and press B, Y, X, B, B
Get 4X Armor
On any level during racing pause the game and HOLD L and press B, Y, X, B, B, B, B
Get Crazy Racing
On any level during racing pause the game and HOLD L and press B, Y, X, B, Y, X
Get Insane Racing
On any level during racing pause the game and HOLD L and press B, Y, Y, B, Y, X
Get Super Bullets
On any level during racing pause the game and HOLD L and press X, X, X, X
Pick level
Put in the code PASSPORT
Get Demolition Mode
Put in the code TNT
Get Deep Descent Level
Put in the code AQUA
Get Double Cross Level
Put in the code BONSAI
Get Enemies Vanquished Level
Put in the code TRACTION
Get Island Infiltration Level
Put in the code PARADISE
Get Nightshift Level
Put in the code HIGHRISE
Get Phoenix Fire Level
Put in the code FLAME
Get Nick Nack in Multiplayer
Put in the code BITESIZE
Get Wai Lin in Multiplayer
Put in the code MARTIAL
Get protect Mode
Put in the code GUARDIAN
Get Uplink Mode
Put in the code TRANSMIT
Unlock Explosive Scenery
Put in the code BOOM
Get Teamwork Koth Mode
Put in the code TEAMWORK
Goldeneye Strike
Put in the code Orbit
Assassination Mode
Put in the code SCOPE
Get Equinox Level
Put in the code VACUUM
Get Faster Laser
Put in the code PHOTON
Unlock Max Zorin for Multiplayer
Put in the code BLIMP
Unlock Oddjob for Multiplayer
Put in the code BOWLER
Unlock Goldfinger for Multiplayer
Put in the code MIDAS
Unlock Christmas Jones for Multiplayer
Put in the code NUCLEAR
Unlock Miss Galore for Multiplayer
Put in the code CIRCUS
Unlock Jaws for Multiplayer
Put in the code DENTAL
Unlock SCARAMANGA for Multiplayer
Put in the code ASSASSIN
Unlock Baron Samedi for Multiplayer
Put in the code VOODOO
Unlock Xenia for Multiplayer
Put in the code JANUS
Unlock Tuxedo for Multiplayer
Put in the code BLACKTIE
Unlock Stronger Tranquilizers
Put in the code SLEEPY
Unlock Sniper Level
Put in the code MELTDOWN
Unlock Golden Gun
Put in the code TARGET
All multiplayer Characters
Put in the code Party
Larger Sniper Rifle Clip
Put in the code MAGAZINE
Unlock Countdown Level
Put in the code BLASTOFF
Larger Sniper Rifle Clip
Put in the code MAGAZINE
Unlock Renard for Multiplayer
Put in the code HEADCASE
Unlock Golden P2K
Put in the code Q LAB (Must have the space)
Unlimited PP7 ammo
When you are playing level 12 on 1 player get a gold medal with all 007 icons.