Apparently there's a possibility of either some add-on content or a sequel on the way for Portal, says Game Informer. I actually just played through the original again yesterday, and I can't wait to see what Valve does with what is easily its most innovative concept. And, given that Portal is in fact part of the Half-Life universe, I'll be thrilled if they decide to give Gordon Freeman a shot with Aperture Science's signature toy.
3D Realms is slower: http://en.wikipedia.org/wiki/Duke_Nukem_Forever
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