After the purchase, you automatically receive the key to activate Sanctum 2 at Steam game platform without regional restrictions.

http://store.steampowered.com/app/210770/Sanctum_2/

Sanctum 2 is the sequel to the world’s first Tower Defense/FPS hybrid game. Pick from four unique character classes and embark on a mission to protect the oxygen-producing Cores from hordes of deadly aliens who are threatened by their existence. Outfit your character exactly the way you want through the new and extensive customization system. Choose your own loadout of towers, weapons and perks, but choose wisely because you are humanity’s last defense against the unrelenting hordes set out to destroy it.

Activation instructions:
1. You must download and install Steam http://store.steampowered.com/ (if not already installed)
2. Register a new account on Steam or go to an existing one.
3. Go to "My Games" and select "Activate via Steam", enter the key.
4. The game after activation appears in the list of games and you can download it from Steam.
5. Enjoy the game.