Zombie

It is a well-known fact that genius and madness are very close together. But what if a genius creates madness? A professor managed to create a virus that could turn mankind into zombies, but he didn't find an antidote before the virus infected him. You're the only people left sane, and you need to create an antiserum in the professor's lab. You don't have much time for that, because the zombies are afraid of the sun, but soon it will be dark and the laboratory will no longer be safe. So hurry, humanity is counting on you!