A great quest is offered to you by private investigator Jonathan. He had a new business that took the hero to an ordinary-looking high-rise building. Inside the house there are floors that you need to move around by elevator. But on each floor, the door to the elevator will have to be opened in one way or another in the 100 Doors Challenge. Here you will need your attentiveness, ability to think logically and solve puzzles. A good visual memory will also come in handy. Don't be surprised if the elevator brings you into the cabin of alien flying saucers, or when you open the door, you will see a huge monster in front of you that you will have to somehow cope with in the 100 Doors Challenge.