Valve don’t usually license out their games to other developers and publishers, but their free to play spin-off has been going for about six years now, under South Korean developers and publishers Nexon. The South Korean company, Nexon has announced another game that is all set for entry into the series and, as you’d assume its themed around zombies. Free-to-play multiplayer FPS Counter-Strike Nexon: Zombies will be heading to Steam this Summer/Autumn. It looks like Zombies will be involved with game modes such as as Hostage Rescue and Bomb Diffusion. These modes haven’t been detailed yet, but Counter-Strike Online’s Left 4 Dead-like Zombie Darkness mode might hold a few clues. Valve’s Doug Lombardi couldn’t contain his excitement: “Today we are announci...