Neues Ultimate Zombie Defense 1.0

It’s the story of 5 years ago when you were traveling in a city train and due to the neighbor country, there was a zombie virus spreader on the whole train and futuristic city.
Now you have to save all citizens because you have got military and special agency training of commando shooting.
Shoot as many zombies as possible and become king of ultimate zombie defense. Zombies' wave will be going to increase but you've to be a sharpshooter and complete all rescue missions!