How to get a CD Key for free
1 - First step is to register as the member
2 - Go to the "Earn Coins" page
3 - Choose an offer and complete it with valid information
4 - After completion your coins will be automatically awarded to your account and you can get the Extinction CD Key
About This Game

Description
Extinction is a short but immersive singleplayer horror game where you play as a young traveler who is exploring an abandoned valley called "The valley of Extinction. Your role is to explore different places in the valley of Extinction such as a deep, dark forest and an old basement. In these places you will find different possessed monsters who want to kill you. Trying to survive will soon be in your best interest...
Content
Extinction contains a linear singleplayer horror experience, in which you will solve different puzzles, explore different, haunted places and most importantly try to survive.
(USE HEADPHONES FOR BEST EXPERIENCE)
(Warning : Game contains some gore.)
If you are having trouble with the install then you probably need to download visual c++ redistributable, you can do that in this link https://support.microsoft.com/en-us/topic/the-latest-supported-visual-c-downloads-2647da03-1eea-4433-9aff-95f26a218cc0
IMPORTANT : if game is not working properly when started then you need to wait untill it loads and dont click on it as it may cause it to crash, if movement is unresponsive then press "escape" button and click on continue.
Source:
Extinction - SteamPowered.com
Instructions to activate steam keys
1 - Download and install the Steam client on your PC.
2 - Open the Steam client, login and locate the Games tab on the top menu. Click this and then select “Activate a Product on Steam…”
3 - Enter your activation key that appears on the email and follow the instructions to activate it.
4 - Your game is now viewable in the “Library” tab and is available to download/install when you’re ready