Within this Modpack there are 4 Difficulties, each of them with more and more features than the last.

Features

Easy Mode: Non-Progressive difficulty, weaker mobs, and a more creative and relaxed experience.

Normal Mode: A little harder than Easy Mode, but less difficult than Hard Mode, makes it a challenge to fight several zombies at once, and survival is more difficult.

Hard Mode: Progressive Difficulty is added, and it makes the zombies a LOT harder to fight, even one can take you down if you aren't careful.

Hell Mode: Are you sure? This difficulty isn't even remotely fair.

How to change difficulty: After downloading the modpack, click the Modpack Settings button (three dots) or the Change Versions button, after that, a dropdown menu should pop up of which modpack version you want, change that to any of the four provided, then check Update to new Profile.

Update 1.0: Launch

Update 1.1: Easy Mode buff

Update 1.2: Normal Mode zombie balance changes.

How to do multiplayer (With Aternos server hosting)
Aternos does not think we are popular enough to have a place in their modpacks, please download so we can get there, maybe then we wont need a mod to play multiplayer.

How to do multiplayer (without Aternos server hosting.)
Install Essential mod in browser (1.12.2 FORGE), click Open Folder in Modpack Settings, drag Essential into the folder labeled "Mods", then host a world using Essential (everyone you plan on playing with needs Essential installed, and I recommend that the person hosting has the strongest internet, as this does not run on a server.)

OSZ - Ok So Zombies

[FORGE] Simple Zombie Apocalypse

Aquaculture 2

Bad Mobs

Baubles

Better Advancements

Biomes O' Plenty

Bloodmoon

BountifulBaubles

Carry On

Chameleon

Clear Glass with Connected Textures! [16x]

Clumps

Collective

Comforts

CoroUtil

Crafting Tweaks

Day Zombies

EASY CRAFT

Easy craftable saddle

Easy Ladders