Zombie Hunting Ground-Shoot

In the biochemical crisis, you escaped from the hands of zombies, but were taken away by a group of mysterious people.
They took you to a place with more advanced technology and gave you a lot of supplies.
At first you were a little afraid , but the people in this place were very kind to you.
You would live in this place, and they have taught you a lot of ways to make advanced technology tools.
One day, you saw their research on zombies in the scientific research base.
You are still very angry about the zombies on earth. A counterattack war is about to begin.