Metal Gear Rising: Revengeance is finally out for PC via Steam, however the game suffers from a nasty bug that requires players to be Always-Online in-order to make progress further. So if you are planning to play Metal Gear Rising: Revengeance offline, prepare to get disappointed.
Konami via Twitter has officially confirmed that Alway-Online issues in Metal Gear Rising: Revengeance is not intentional, and it has been discovered as BUG and a fix for it is already in development.
Let us know in the comment section below what other issues you are facing with Metal Gear Rising: Revengeance on PC.
We are aware of the offline play issue for Metal Gear Rising for Steam and are working on a fix. Please stay tuned for more updates!
— Konami (@Konami) January 10, 2014