Half-Life 2: The Orange Box (Xbox 360)Portal was offered to XBLA, but rejectedGameIndustry - April 28, 2008
Submitted by tyrile (511)
at 5:22AM PST on April 28, 2008
GamesIndustry.biz has learnt that Valve asked Microsoft if it was possible to place its award-winning Orange Box title, Portal, on Xbox Live Arcade for download, but that it was rejected.
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I meant that Portal 2 / Episode 3 will probably use a revision of the Source Engine. Valve have added significant features to each Episode released so far so it won't be case of pop in the Orange Box disc and play Ep3 or Portal 2.
To offer them as DLC they'll need the engine as well which makes the file sizes much bigger. Maybe by then MS will be open to much bigger games being offered for download. They do Shivering Isles, map packs & Xbox Originals like you say.