Hollow Earth Expedition (HEX) is a role-playing game set in the "pulp" 1930s that assumes the Hollow Earth theory is true. Published by Exile Game Studio, HEX has been nominated for several Origins and ENnie awards since its release in 2006.

The current product list is as follows:

  • Hollow Earth Expedition (available in French and German)
  • Game Master Screen
  • Secrets of the Surface World
  • Mysteries of the Hollow Earth
  • Miracle Stone of the Amazon and Frozen City of Terror, both from the Perils of the Surface World series of pdf adventure modules
  • Ubiquity Style Chips for each of the three sourcebooks
  • Quick Start Rules and adventures for Free RPG Day 2008-2010


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