Dirt 3 is currently 100% free on the Humble store. All you need is a Humble account. Free is good at the best of times, but the Dirt games are some of the finest racers of the past decade, so this is as good a time to try one if you’ve never played them.
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Humble is just destroying any chance of me ever not having a massive backlog. In the last couple weeks I’ve picked up about 21 games for a grand total of $23.