In Into The Dead Trigger, you will find yourself in an extreme situation, where zombies all over the city invade all the houses and buildings in the city, and they fight as hard as they can, leaving no life, so they will not hesitate to attack you if they see you, if they hear any movement or noise, they will run like this, when you are trapped in a building where every apartment is in trouble. 

The moment came, and because of the large number, every room was uncertain.