Play Alien Swarm for Free, Get TF2 Hat

If there's one thing Team Fortress 2 players covet more so than anything else, it's the almighty hat. Valve, knowing this, smartly decided to add an irresistible incentive for TF2 players to play their new free-to-play game, Alien Swarm. Complete a couple of co-op missions and a new hat is yours (as you can see in my screengrab below).

Like I said, it's free, so go out there and claim your hat!