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ValveTime.co.uk | Valve News, Forums, Steam
In recent news updates from msnbc.com I had read that they are changing the layout of city 17 because those who downloaded the stolen code could release *spoilers* persay. This would not be good for the community that wants the whole story, so Valve has decided to move everything around, and add/delete certain places/routes and endings to the game. It's not official yet, but it maybe be called city 18 instead.