So, the THQ who sold the Humlebundle is giving away Metro 2033 codes for free, all your have to do is Like a facebook page and you will get your key.
THQ is going crazy! Get Metro 2033 for FREE! | Steam Unpowered Click on "Go here to get a copy!" in the middle of your screen.
or go directly
(Not sure if that will work since I have already redeemed my key) (proof that the site is legit https://www.facebook.com/MetroVideoG...48813911813745
Make sure to like https://www.facebook.com/MetroVideoGame
and then press Reveal Code
Enter the code in your steam account by clicking Games -> Activate a Product on Steam and enter the key.
Enjoy free game
(Think you have to be 18 to redeem the code, if you're not 18 on your facebook simply create a new fake account)