To celebrate Halloween this year, Valve are making Left 4 Dead 2 free-to-play, for this weekend only. Starting Thursday — so probably more like Friday here — the game will be free to download and play the whole weekend.
New players can pre-load the game whenever they like, ready for the weekend, but for older players, you might wonder what the appeal is. Apart from playing a sweet game with a bunch of your friends? Gosh, well they’ve also added a new achievement, if that matters more to you, called ‘Good Guy Nick’: “Plays games with free weekend players and helps them survive a campaign.”
So this weekend might be a good time to re-acquire the fun zombie shooter and help out some newbies with their zombie slayage.
Source: L4D Blog