Used to be that if you purchased and downloaded a game from Steam, and it didn't work out for whatever reason, you'd generally be SOL. However, Valve has recently reversed its zero tolerance return policy and will issue refunds for online purchases (with a few caveats) through Steam Support. According to the newly established Steam Refunds page, "You can request a refund for nearly any purchase on Steam — for any reason." That's just so long as you've played the game for less than two hours and request the refund within two weeks of buying it. DLC content has a similar two-hour window while in-app purchases will be refundable for a full 48 hours. There are a few niggling exceptions to that rule -- movies and games you've been banned in, for example, are not eligible -- so head over to the refunds page if you have specific questions about your purchase.