DO NOT OPEN is a first-person horror adventure game with a tense and frightening atmosphere. The usual ticking of the clock stops and the room is filled with ringing silence. It seems that the air can be cut with a knife, and Mike feels the inexplicable approach of something. Feeling like he’s known this all his life and now it’s time to face his fears. You do not know how you ended up in this place, but you better get out of here quickly before your mind becomes part of the endless rooms of this abandoned building.