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For those of you who do not own a copy of Portal, here’s the perfect opportunity to add it to your Steam collection… free of charge!

The fine folks over at Valve are offering the exceptional first-person puzzler for no cost during the next few days. Just head on over to this link and make sure you have an account on Steam set-up. While you’re at it, you might want to thank Valve by picking up the equally awesome sequel, Portal 2. But that’s just a kind suggestion…

[Kotaku]