You can redeem a free Steam key for this game from Humble Bundle
(promotion expires in about 48 hours).
I've played some of this game and the campaign was kinda messed up/disturbing
(hiding among dead bodies
so I can easily tell it's an 18+ game.
I didn't really like the campaign (from the amount I played)
but I think the multiplayer was good. https://www.humblebundle.com/store/homefront
EDIT: first I read that the servers were shut down so I was like:
But on YouTube it seems Steam servers are still up.
Just mentioning this story as an excuse to use the funny cat violin gif.
"Sometimes you gotta run before you can walk." - Tony Stark, Iron Man.