Ana and I have purchased Zombie Army 4: Dead War. Its a follow-on to Zombie Army Trilogy. This game offers more difficulty levels and a semi decent campaign. It is plagued by the multiple season passes, and low price in game purchases. What puts this game over the edge is the revived "Horde Mode" in which you see how many waves you can go on a relatively small map. The objective is to get to the beginning of wave 13 and you can escape if you decide to do so. If you decide to hold your ground after wave 12, the waves get increasingly more difficult and complex.
There are "zombie officers" that perform different functions.
There are zombie "Heavies" which as 'bosses" of different types, like The Butcher who dances at you with a huge buzzsaw looking to take your limbs off, or the Flamer who is not shy about using his oversized flame thrower to knock you down, or anything in its flame spewing path. Add in the Gunner who boasts a HUGE machine gun laying waste to anything he aims at.
There is even a "Screamer" who is blind and attacks by hearing . Be aware because it has acute hearing and is deadly.
Oh did I mention, there Grenadiers who constantly whip explosive or fire damaging grenades at you.
There are pesky zombie Snipers who are pretty accurate, along with their pals who are called Rocket Snipers who propel Bazooka rounds at you feet for splash damage.
Not to mention a sicko looking twisted zombie who is tied up in grenades and TNT and has a rather explosive personality.
There is a Shadow Demon we simply call death. If he "grabs" you and draws you into the zombie chaotic mess, if his actions don't make you fall down, being surrounded by the zombie horde just might.
Oh yeah, then the horde itself ! The "green" zombies that "puke" globs of green goo at you that damage as well as slow your retreat.
The rather quick (compared to most "normal") zombie who wields a MP44 and although not purely accurate, can make you curse if it hits you and you have very few hitpoints left.
When you're not looking - or paying attention to your feet, along comes the "Creeper" who is a zombie on all fours crawling low to the ground and gnawing away at your precious health. They do not come one at a time, typically if you see one, you can expect to see about a dozen or more headed your way.
Then, the parade of semi regular zombies comes about, mixed in with all the above mentioned beast.

You are then tasked with trying to figure out what to kill first.
Oh, did I mention, that the above list of madness above can come all at once, in a single wave? yeah this is freakin' crazy at times. Ana and I play this on EASY 1 players worth of enemies and as the waves head past 20 , it gets down right chaotic. I don't even want to think what comes on Normal mode, Hard mode or Brutal mode.

THIS game is truly a game of Chaos management. Although, the campaign side of the house is a little more forgiving. At least in Campaign mode, you're able to use the best of the best guns you can master. In Horde mode, it's luck of the draw on about 6 different gun drops on the map as you progress along. You will hear me say "YES !" when I get the Mosin-III Sniper, a Thompson-III and the M-1911 pistol, as these are the highest ones you can get. A few games you are forced to run the horde gambit with a mediocre sniper, a SMG not to your liking and a pistol which just might heal your team mates.

Fate had something to do with the creation/creativity of Zombie Army 4: Dead War. I feel Fate in my bones every time I start to feel in command of the horde mode only to look up and see three bosses, a massive army of exploding TNT weirdos and snipers trying to keep me busy.

Crazy. But, fun.