The game's basic gameplay is the same as the original Painkiller. The player has to face off numerous enemies and defeats them, moving from one location to another. All the weapons have alternative fire regimes. While the majority of enemies and all original weapons are presented, the game features some new additional gameplay elements not seen in original or its other expansions.Go to: http://store.steampowered.com/ and download STEAM client
Click “Install Steam” (from the upper right corner)
Install and start application, login with your Account name and Password (create one if you don’t have).
Please follow these instructions to activate a new retail purchase on Steam:
Launch Steam and log into your Steam account.
Click the Games Menu.
Choose Activate a Product on Steam…
Follow the onscreen instructions to complete the process.
After successful code verification go to the “MY GAMES” tab and start downloading.