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.

As always, we have a million Steam keys to give away, in association with Bundle Stars, a digital store that sells a wide range of games, and arranges them into bundles to offer discounts of up to 97%. You'll also find plenty of discounts on individual games on their front page.

GTR Evolution and Race 07 were created by SimBin, who more recently released their free-to-play racer, the RaceRoom Racing Experience, which also comes with today's free Steam key. They've been making racing games for nearly a decade now, so you can expect some solid high speed action, for the price of a quick Facebook like.

All you need is a facebook account to help yourself to one of the best sim racing games made so far.