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The Search for Planet X

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Since 2016, astronomers have been searching for a distant planet to explain the unique orbits of observable objects in the solar system. 

Do you have what it takes to find Planet X? 


  • Players take on the role of astronomers, participating in this real scientific investigation.
  • Use the free companion app to survey for objects and take other actions.
  • Use the app results and the logic rules to find objects, publish theories, and deduce where Planet X must be!
  • Created for 1-4 astronomers, ages 13+, to discover in 60-75 min. 

Contents Summary:

  • 1 Solar System Board
  • 1 Earth board
  • 1 Wooden Sun Disc
  • 48 Theory Tokens (12 per player)
  • 4 Player Screens
  • 8 Target tokens (2 per player)
  • 4 Player Miniatures
  • 1 Pad of Note Sheets (double-sided)
  • 4 Expert Mode Cards
  • 1 Rules book
1 to 4
Time to Play:
60-75 minutes
Game Designer:
Ben Rosset
Game Designer:
Matthew O'Malley
Game Artist:
Michael Pedro
Game Artist:
James Masino

1 Review Hide Reviews Show Reviews

  • 5
    Great deduction game!

    Posted by Evilmanta on Jul 26th 2021

    This game is a fantastic deduction game. It's great that people of different skill levles can play with each other at the same time by adjusting your individual difficulty level at the start of the game.

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