The Hollow Planet is a print and play escape room. What this means is that, upon purchasing it, you receive a PDF which you then must print out. You are then instructed to cut along certain lines. The game is then comprised of various paper-based activities that involving folding and moving the cut-out pieces around, matching them up like a puzzle. There's also some decoding and some online elements. This may not sound the most exciting, but I had a great time playing it with my family and I'd definetly recomend it.