SOD 2 .
I've been playing this game for around 4 years now. It's pretty fun IMHO, So I keep coming back here and there.
I'll tell you why?
I like the fact that there's really No End Game. You just continue to the next map. It's really about survival, you need water, electricity, and food etc etc. Oh yeah and lots of amo.
The feature I really like is the base building. The bigger the base doesn't always mean the best. If you have a big community then go for the larger base but if you have a smaller community then go for the smaller bases.
Another cool feature is the Perma death. When you die your character dies and He/She does not come back. I have some characters that I've had for about 4 years and the rest are pretty new.
There's about five levels you could play at. Green Zone is basically for beginners, then Normal, then there's dread. Dread is in the middle, it's not too hard for you. But it'll give you a good challenge.
Nightmare is where things start getting interesting. Less items to loot and the plague hearts are pretty tough. Several updates back. There used to be sieges to where your base would be bombarded by zombies. I literally had a whole community get wiped out on one of those sieges. Now this was my first playthrough of nightmare.
The biggest and hardest challenge is lethal zone. So you best be prepared because if not , You could pretty much go through your whole catalog of survivors.
So give this game a try and have some fun killing Zombies.