The Serum is awesome online game for every lover of horror online games and particularly zombie games. The main protagonist of this game is Zack. He is simple guy, however, he is working in biomedicine laboratory as assistant of famous professor Rudolph. They were working as usually on some types of serums, when recently professor Rudolph disappeared somewhere with some of these serums. Moreover, the laboratory full of undead creatures. Now, Zack has a clear task. He must to find what’s going on in the lab and to kill all zombies. Help him in this task.
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