ABOUT THIS GAME
Mike Goreng is trapped in a warped version of his own home. What's going on? Where are his wife and daughter? As a scientist, Mike can't come up with an explanation for what is happening, but his instinct tells him that he is in severe danger... and something evil lurks in the darkness.

A TRUE CHALLENGE THAT DEMANDS THE BEST FROM THE PLAYER
DO NOT OPEN is a challenging survival-horror classic with gameplay based on escape-room mechanics. Each time the player crosses a door of the Hall of the Victorian mansion Judith's Manor, he will enter a different layer of each area, and its puzzles and riddles will change randomly so that each game is different from start to finish.

To unravel the terrible mystery of the manor, the player will find different newspaper clippings, diary pages or other items in each game, making the plot a puzzle in itself. But he must do it before time runs out, or he'd better hide from the terrible threat that stalks him.

Are you ready for the DO NOT OPEN challenge? HIDE, SOLVE or DIE!
MATURE CONTENT DESCRIPTION
The developers describe the content like this:

Disturbing scenes, blood, flesh and partial nudity