When you are a human being, the goal is to survive. If you survive until the end of the invasion, you will receive a bonus. If you are bitten by a zombie, you will turn into another zombie. After that, the goal is to bite all humans and prevent them from winning. This is a collective game, but without cooperation, you can act on your own.
You can kill zombies with weapons, just for defense. Point your weapons towards the zombies and don't let zombies touch you. If you register in the game, you can join the world rankings and try to TOP.
Different servers have different maps, so the game is very flexible. At first, it seemed strange that many gamers and servers were always occupied. But, when you play a few rounds, you will understand that this eternal battle is really interesting.