Counter-Strike Nexon: Zombies Full Version Freel
It has almost 60 maps (that's a lot!) full of zombies. Maps unlocked as you complete stages that explain the backstory of Counter Strike Nexon Zombies. They will take a long time to unlock, and even longer to master. Easy does it: you will have classic maps like de_dust.
Counter-Strike Nexon: Zombies Full Version Freel
From these user mods, alternatives such as Wolfteam were born. Some previous games, like Counter-Strike Condition Zero and its campaign, drew their inspiration from this unofficial version. But the zombies in Counter Strike Source 1.6 No Steam were so popular that they have become a legit game.