Well, this sucks. After nearly a year, the 2013 action game Metal Gear Rising: Revengeance has come to PC, but it arrived with a dark passenger: It apparently won't work without an internet connection.
The single-player Revengeance is digitally available on Steam, but readers have written in to alert us that the game won't start in Steam's offline mode. Worse, if your internet connection cuts out while you're playing, you'll be instantly kicked from your game. Plenty of Steam users seem to be having the problem, and we've tried it ourselves and had the same result.
It's not yet clear whether the problem is just a bug or whether it's due to DRM created by publisher Konami. Of note is the fact that the game's Steam store page makes no mention of an internet requirement either in its game description or under its system requirements.
We've reached out to Konami and Valve to ask about this, and to see if it is indeed DRM or if it's a bug that could be fixed in the future. In the meantime, buyer, beware.
Update 1/10/14: Sounds like it was a bug after all—the issue has been taken care of, according to a couple of tweets this morning from Kojima Productions' Steve Key. A Konami representative also confirmed to Kotaku that the issue has been resolved. New downloads should work fine,
though already-affected users will probably have to re-download the game and Konami now says that the fix should immediately go into effect with a Steam restart.