So I've been playing CS 1.6 again.
I love zombie servers. And recently I found a good one.
It's a CSO zombie server. What's CSO? Well it's pretty much a weapons mod for CS 1.6.
It also has a shitty level system, but it's fun.
Problems I have is... well there's actually only one. It's the lack of knockback for zombies.
In this server doesn't have infinite ammo in a clip, so you gotta reload. And no knockback makes it very hard for you as a human.
It becomes a less of a problem as you level up, but it's still a massive pain.
Also, you can take missions (under attributes in the 'm' screen). Should you play it, under easy difficult you can take missions for leveling up. Before you start leveling, take those missions.
P.S. I have tried to search for good zombie servers on CS:GO, but there is nothing, literally nothing good.