Apparently that Valve hack was much worse than previously thought.
At first it just looked like the source code was stolen. Actual level data and art assets weren’t part of the ‘robbery’, so anyone who actually downloaded the source wasn’t able to do much with it, other than build a brand new game using the HL2 engine as a base.
Or so it was thought.
Today CNN is reporting that maps and other crucial data WERE stolen, and that a playable build of the game is now ‘out there’. Doh.