There's a virus outbreak at a medieval military base. There are a lot of mutated zombies out there. The base doctor has developed a vaccine that works well against this mutated virus, and your job is to protect it from the zombies. Are you ready?

There's a virus outbreak at a medieval military base. There are a lot of mutated zombies out there. The base doctor has developed a vaccine that works well against this mutated virus, and your job is to protect it from the zombies. Are you ready? 
 
1:6 different types of firearms can be used, the operation feel is very good. 
2:3 missions, and earn gold upon completion. 
3: Endless challenges that don't require a replay even if you fail. 
 
Gameplay: Upon entering the game, you can see the protective shield protecting the vaccine, and your task is to protect it. WSAD move character, space jump, left mouse button fire, mouse on the ground gun press F can pick up. Press ESC to bring up the game board. Press TAB to switch between languages.

Good Game Database

Operation Save Anna Achievements