Aftermath is a hl2 mod which involves the player killing waves of the undead with your friends or alone using weapons, your knife or even blow them up with grenades and set them alight with Molotov's.
This mod is poorest I ever seen; One reason why I rated it as 1 out of 10 because it had no mission, and I noticed upon running this mod, most detested multiplayer menu... It is more confusing menu and fonts is not clear... I am not joking about it... Hmm, I think it deserves lowest rating ever!!!
A very fun mod to play when you just wanna hang out with friends and play something zombie-related. I'm enjoying playing this as much I enjoy reviewing it. I can tell the developers of this mod have really worked hard and are continuing to update it. Cheers to a great zombie mod!
It says what it has to offer in the first paragraph of the main page.
It's a copy of COD zombies on source, and to be honest, it's nicely done.
While some bugs exist, it shouldn't stop people from indulging in mindless zombie killing. For awhile, anyway. The mod quickly gets rather old after a couple of hours.
Regardless, those who liked COD zombies should expect to have some fun. Those looking for more may need to look elsewhere.