A rock-solid combination of rock-rolling action, deep strategy, and captivating art and music from different ages of history, this is a game of crush or be crushed! Two castles stand opposed; one is yours, the other is your enemy’s. They're a jerk and their castle sucks, so you’re going to try to smash it using an enormous boulder. Even as they build up their defenses, you're ready to roll over them in order to raze that unsightly tower. But beware! There’s a giant boulder headed your way, too.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.