Simply download and play the game for 5 minutes and it’s yours free forever on Game Sessions. (Bloody hassle I know, who wants to actually play a free game, nobody does that)
Everyone probably already has the game however if you don’t then you can have it free.
Bulb from the site:
Play the game for 5 minutes to activate and keep on GameSessions forever.
About This Game
Discover a stunning world of motorsport brought to life, from racing muscle cars through the iconic streets of San Francisco and competing in the legendary 24 hours of Le Mans to drifting around the docks of Yokohama. Jump behind the wheel of exhilarating racing cars in the most aggressive, spectacular wheel-to-wheel races you've ever experienced.
Key Features
Featuring only the most powerful race cars – current and classic, circuit and drift – players will compete to conquer the most prestigious official race tracks and championships and then go beyond to compete in challenging city-based competitions, through to road events and urban street races.
Thanks last time I forgot to claim the steam key from Humble :( too many free games …. lol