This game has amazing balance and depth! The scaling of resources expended and harvested and the complexity of items makes this game worthy of a 5/5. This is a very fun game similar to motherload :)
The reason they have the quarintine is so the infected don't spread to other cities
Lab of the dead; the prequel starts a little before this. The events happen side by side In lab of the dead and road of the dead. You should play lab of the dead after this game if you liked it
the prequal is lab of the dead in the game it explains how the outbreak started and why there are the "strong" zombies. He also has a brother in Evans City