Global License
Description: unlock the Global License

How to: You have to acquire each of the other regional licenses in the game. Now, earn a million Global Points to unlock the Global License. All other not yet acquired licenses will be automatically acquired when you do.

All Drift Cars
Description: unlock all of the drift cars in the game automatically

How to unlock: insert TUN58396 into the in-game cheats menu.

All Muscle Cars
Description: unlock all of the muscle cars in the game automatically

How to unlock: insert MUS59279 into the in-game cheats menu.

Liveries
Description: unlock the liveries listed below, insert the cheat code password given into the in-game cheats menu:

Buchbinder 320si	F93857372
Gamestation BMW 320si	G29782655
Micromania Pagani Zonda R	M38572343
Play.com Aston Martin DBR9	P47203845

Unlock Bonus Livery Cars (GRID PS3)
[Submitted by: Toebin ]
Description: Unlock Bonus car PAGANI ZONDA Micromania Livery
How To:From the main GRID menu go to Options > Bonus Codes > Enter Code M38572343

Description: Unlock Bonus car Aston Martin DBR9 play.com Livery
How To:From the main GRID menu go to Options > Bonus Codes > Enter Code P47203845

Description: Unlock Bonus car BMW 320si Buchbinder Livery
How To:From the main GRID menu go to Options > Bonus Codes > Enter Code F93857372

Description: Unlock Bonus car WTCC Spec BMW 320si Gamestation Livery
How To:From the main GRID menu go to Options > Bonus Codes > Enter Code G29782655

Ninja Difficulty
An elite difficulty level called Ninja is available for selection in the game once you have won every trophy and successfully completed each head-to-head race. Sounds easy huh? right!

All Cheats
Although all of the cheats are listed here already, they can be unlocked for selection automatically when certain conditions are met in-game. First, you must achieve a first place finish in all of the global events, which will bring you to one last head-to-head race. After winning that race, all of the cheats will be unlocked in the same place where the cheats are otherwise inserted in the game.