Counter-Strike: Global Offensive is certainly at the more serious end of Valve's multiplayer services—being about guns and terrorism, rather than gravel or wizards. Nevertheless, they're getting in on the Halloween spirit with the temporary addition of masks, ghosts and zombie chickens.
"Each of our hardened operators have decided to have a little Halloween fun by wearing masks," explains the CS:GO blog (opens in new tab). Masks are coming across from Payday 2 and Team Fortress 2.
In addition, there's a chance you'll see fallen teammates as ghostly figures haunting the map. And, of course, there's the chickens. "For too long the chickens of CS:GO have idly watched as their brethren were slaughtered by the droves," Valve write, "and on All Hollow’s Eve there is no more room in Chicken Hell." Basically, if you kill a chicken, it will resurrect—but green.
The changes come as part of a more general patch (opens in new tab)—filled with spooky notes like "fixed wallbang inconsistency through closed window in apartments near Bombsite B."