You buy the official activation key for Steam, Killing Floor as a scanned image of the box with the licensed game from 1C.
Britain was plunged into chaos. As a result of a failed experiment in the creation and cloning of "super-soldiers" the streets of cities and suburbs flooded armed and extremely dangerous monsters. The army and police in a hurry to join efforts to fight mutants, which pose a serious threat to national security.
The purpose of your team - ruthlessly kill anyone who is not a person.
1. Download and install Steam - http://store.steampowered.com/
2. Register your new account on Steam or go to an existing one.
3. Go to the "My Games" and select "Activate via Steam", enter the key.
4. After activating the game appear in the list of games and you can download it from Steam.
NOTE: This is the official version of the company "1C" - it has a territorial restrictions (suitable only for Russia and CIS countries)!
After activation serial key in the steam, the key becomes not valid, ie, re-use it is no longer possible, so be sure to remember all the details of your account!