If i purchase Hl2 over amazon....

[venom1221]

will i get a cdkey immediately and be able to play css?

 

[KagePrototype]

Nope. you'll have to wait for the box with the CD Key in it.

 

[Mujuro]

Buy over Steam.

 

[Paappa]

will i get new cd key when i buy HL2 via Steam?

 

[YellowPeril]

you wont really ever get the key if you buy over steam. a key will be tied to your accout, so you will not need to know the number anyway.