These mystery boxes are immersive, excellently put together, and very well-thought out. I usually work them by myself, and it takes between 3 and 5 hours. I love working through them! A Deadbolt box is good for 1 person, a date night, or a larger group. I don't write on mine so when I am finished, I put it back together and share it with a friend. Thanks, Matt Dowdy, for getting me hooked on them.