For me it's Undead Nightmare, the Red Dead Redemption expansion. I play it just about every year around this time, a lot of fun.
Kotaku just wrote a great article on it: http://kotaku.com/the-zombie-game-that-gets-halloween-just-right-1739551326
Kotaku just wrote a great article on it: http://kotaku.com/the-zombie-game-that-gets-halloween-just-right-1739551326