If you haven’t had a chance to play XCOM: Enemy Unknown, now’s probably the best chance you’ll get. Green Man Gaming is currently offering the game for free, alongside an 80% off voucher for XCOM: Enemy Within.
To redeem your copy of the game, you will first have to vote at the Golden Joystick Awards with a CVG account. Once you’ve done that, you will need to sign up for Playfire and link it to your Steam account to receive a Steam code for XCOM: Enemy Within. A few hoops to jump through, but a free game is still a free game! For more detailed instructions, go to this link.
Remember that the voting is taking place until October 20.
Source: Green Man Gaming