From the back cover: The Cube stank of evil and the Demon you slew confirmed your fears. Venture into a place where you will never know what will be up next. Assume nothing or face a fiery death in a true task of dungeoning skills and adaptability. This Adventure is for three to eight players of second to fifth levels of experience. Question of Gravity is suitable for use with Dungeons & Dragons(TM), Advanced Dungeons & Dragons(TM), Tunnels and Trolls(TM), and other fantasy role play systems.