If you want Zombie Modes + the essence of Counter Strike, Nexon will deliver that, and more. On top of that, you can modify the weapons. From the KSG-12 combat shotgun to the Dual Infinity sword. Weapons? The arsenal in Counter Strike Nexon: Zombies is huge and varied. Easy does it: you will have classic maps like de_dust. They will take a long time to unlock, and even longer to master. Maps unlocked as you complete stages that explain the backstory of Counter Strike Nexon Zombies.
It has almost 60 maps (that's a lot!) full of zombies. Don't like those options? Don't worry: classic modes are also available, Counter Strike, Bomb Defusal and Hostage Rescue. You will find close to 20 modes like Beast Mode, Bazooka Mode or Football. Counter Strike Nexon Zombies has a lot of content despite being a free game.