Zombie Shooter 2 is a unique blend of two game genres - Action and RPG. Every player can choose a character to the liking, get experience to develop skills, earn money and spend it at weapons, medications and useful devices. All of this will be used against thousands of enemies.
Open the Steam client, login and locate the Games tab on the top menu. Click this and then select “Activate a Product on Steam…”
Enter your unique code that's displayed on the 'Orders' page of CDKeys.com and follow the prompts to activate.
Your game is now viewable in the “Library” tab and is available to download/install when you’re ready. You can find additional support for the Steam client here: https://help.steampowered.com/en/wizard/HelpWithSteam