The listing, Post Apocalyptic Mayhem steam key has ended.
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If you haven't done so already, visit the Steam website and install the Steam client which you will see at the top right of the page. Now run the Steam client software on your computer,go to the LIBRARY and click on "+ Add a Game" (bottom left of your screen). Next, click the middle menu option, "Activate a Product on Steam...". Follow the prompts and then enter your Steam key in the box underneath "Product Code", then click "Next". You can install the game right away, or cancel and install it another time.
Post Apocalyptic Mayhem lets you race and battle heavily-modified vehicles through numerous breathtaking tracks and lay waste to other racers in over-the-top vehicular mayhem. You can use special vehicle abilities to cause spectacular destruction to enemy cars as you fight and speed to victory.