Rockstar, the game developer that gives us awesome games like Grand Theft Auto, Red Dead Redemption and... well that's mostly it lol - they've decided to get in on the separate game store / launcher type of game. (pun)
So now, if you download their new Rockstar Games Launcher, you can claim one of their classic hits GTA: San Andreas for free!
Mechanics are pretty simple. Download the aforementioned Rockstar Games Launcher, open the launcher, login, and click on GTA: San Andreas, and click on CLAIM FREE GAME. There's a couple more buttons to click to confirm, but thankfully you don't have to input any payment details to claim the game - that's always a bonus.
That's all there is, so enjoy your free game!