Quoted :

" Leading developer and graphics company offer award-winning game via Steam
Valve and NVIDIA have announced that all NVIDIA gamers may receive a free copy of Portal: First Slice, a special version of the new game from Valve, by visiting this website and "Taking the test." Steam will then auto-detect the presence of NVIDIA hardware and make Portal: First Slice available immediately, free of charge. To make it easy for all NVIDIA customers to redeem this offer, a link to the Steam offer will also be included in all NVIDIA drivers. "

http://www.gamershell.com/news/44536.html

Get it here:

http://www.steamgames.com/nvidia1

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