Microsoft's Major Nelson has announced that a bunch of Valve games have been buffed with Xbox One X support, including the content-packed Half-Life 2: The Orange Box.

In addition, Portal: Still Alive, Left 4 Dead, and Left 4 Dead 2 now look a hell of a lot better than they did back on the Xbox 360, thanks to the added technical grunt of Microsoft's latest box of tricks.

Earlier this week, Microsoft announced that it had added three new games to the Xbox One backwards compatibility lineup, in the shape of the Crysis trilogy

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