In Sanctum 2, you will have to utilize elements of multiple gameplay genres to succeed. Build towers and walls during the building phase before the enemies attack, then jump into the fray and help your towers blast everything to pieces in FPS-mode. You can progress through the single player campaign yourself, or play up to 4-player co-op with your friends to discover the secrets of the planet LOEK III and why the aliens are so set on destroying the Cores you are sworn to protect.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.