""Vanished" is a two-month-long game, which debuted the week of April 4 and stems from an initial scenario revealed in recent video messages on the site. The premise is that people living in the future have contacted us in the present, to answer a question: What event occurred between our time and theirs that led to the loss of civilization's historical records? Students must decode clues in hidden messages, and in response find and provide information about Earth's current condition, such as temperature and species data, to help people in the future deduce what wound up happening. "