B.07: Special Unlockables
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At the start screen (the screen that says 'Click to continue' and appears 
right after the opening cinematic), type in the following codes. You have 
to type the codes blind (i.e. nothing shows on screen), so type carefully:

castrol: Unlocks a Castrol Syntec Ford GT in the Bonus Cars.

burgerking: Unlocks the Burger King Challenge in the Challenge Series.