What Sleeps Behind the Door? Time passes, the pages turn... and a new chapter unfolds in an unfamiliar land! Get ready for a two-dimensional role-playing adventure for the ages as Mario returns to paper form to discover a mystery that sleeps behind an ancient, legendary portal called the Thousand-Year Door. The quest is long, the dangers many, and this time, Mario will ha ve to make full use of his papery qualities just to survive. ESRB Rating: Everyone