Grab it if you don't already have it... http://www.pcgamer.com/2014/07/23/free-steam-key/
We're finishing our five-week, million-key giveaway bonanza with the fastest game of the bunch. Grab yourself a free Steam key and blast off into the sunset with a copy of GTR Evolution, the expansion to the lauded Race 07, which is also included in this week's free bundle. GTR Evo gives you a selection of 49 GT cars to drive across 19 tracks, and the original Race 07 package includes 32 additional tracks, including classics like Monza and the Nürburgring, and 300 cars to crash. If you've never tried racing games before, GTR Evo is a great place to start. Claim your free Steam key below.