THQ is giving away the dark first-person shooter Metro 2033 completely free.

To claim the freebie all you need to do is like the Metro 2033 Facebook page, at which point you’ll be given a Steam code.

THQ recently got together with the Humble Bundle guys to create the THQ Humble Bundle which gets you a humongous amount of games for a price of your choosing. Metro 2033 is one of the bonus games available as a reward for beating the average price.

If you’re after grabbing Metro 2033 for free you’ll need to make sure you take action before December 16.