Here is an information overview of the State of Decay Breakdown DLC.
"You've survived State of Decay. Now it's time to move forward and tell your own story. Take on an endless campaign with twists and turns based entirely on your own choices. Build up your score in the face of an ever-escalating zombie threat, and compete with survivors around the world. Complete challenges to unlock new heroes with unique weapons and skills. The deeper you go, the tougher it gets, and every choice is yours."
In Breakdown, you can leave Trumbull Valley via an RV which must locate, repair and find fuel. You can only take a certain number of people with you, and a limited number of resources. Once ready, you can travel to a new place which will be crawling with undead and new resources to find. Note that the map is still Trumbull Valey and all the locations are the same, but everything is unexplored and unlooted, and all the bridges on the map are unblocked.
When you first start, you start with a random character. After you complete specific challenges, you unlock and can choose to play as a "hero" character. Each hero character comes with their own unique abilities and weapons. You can choose a difficulty when starting a new game, rannging from 1 to 10.
A preview of the difficulty:
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