The Search for Planet X

Foxtrot Games

About this game

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


In THE SEARCH FOR PLANET X, a tabletop board game from Foxtrot Games, you will take on the role of these astronomers, using observations and logical deductions to search for this distant planet. The game uses a companion app to randomly choose a location for Planet X and other objects, following predefined logic rules.


As the earth travels around the sun, you will interact with the app to perform various research actions. You'll note what you learn on your deduction sheet, and you'll be able to piece together all the available information to publish theories and score 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.

Ratings and reviews

The experience this game provides would not be possible without this fantastic app. Great game design, produced to a very high standard by the fine folks at Renegade Games. The app is straightforward, intuitive and pleasant to interface with during game sessions. This from a lifelong boardgame lover who prefers NO app integration, thank you very much. I happily make an exception here. Well produced, solid app that does what it's supposed to with no major bugs or flaws that I have experienced.

One of my MOST favorite board games. The game works only with the app though. The app works great! I love the idea, and think you all should advertise the game more and translate to other languages!! Also would have loved if you added a deck of cards with everything the app has to offer, so that even without the app you could play the game since when you can't use the phone, the game is unplayable.. otherwise, favorite game :3

Many elements of the application are not readable in the dark theme of the display.