If you haven't already picked up Valve's charismatic multiplayer shooter in one of their many, many, many sales, you need not worry because now you can do so for even less. None, to be exact. Valve has announced that TF2 is going free-to-play and will be supporting the game through micro-transactions. But, if you still want to give something to Valve you can buy a virtual hat. Free to play trailer below.