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ValveTime.co.uk | Valve News, Forums, Steam
Wacky and satirical
SP only as far as I know.
You play as Gordon's brother, Morgan Freeman and it seems to take place as the Combine start to take over. There's plenty of little spoofs (such as fighting alongside Jack Carver of FarCry - his apartment is full of pictures of island landscapes and Eva er whatever the chick's name was in FarCry)
Anyways...might as well check it out. So far it's fun