For the past century, astronomers have been searching for a distant planet to explain unique orbits in the solar system. Designed by Ben Rosset and Matthew O’Malley and featuring art by Michael Pedro and James Masino, players take on the role of astronomers, using observations and logical deductions to search for this hypothetical planet. Each game, the companion app randomly selects an arrangement of objects and a location for Planet X following predefined logic rules. Each round, as the earth travels around the sun, players will use the app to perform scans and attend conferences. As they gain information about the location of the objects, they'll mark that information on their deduction sheets. As players learn the locations of the various objects, they can start publishing theories. Once a player believes they know its location and the objects on either side of it, they use the app to conduct a search. The game ends when a player successfully locates Planet X, and all players have a final chance to score some additional points. The Search for Planet X captures the thrill of discovery, the puzzly-nature of astronomical investigation, and the competition inherent in the scientific process. Do you have what it takes to find Planet X?