Small World Underground is a stand-alone game set beneath the surface of the same fun, light-hearted Small World universe of epic conquests and fallen empires. Featuring new Races and Special Powers, it also introduces a new twist to the original game play - Monster occupied regions that protect Relics and Places of great power. While more daunting to conquer, these bestow even greater powers to their owner. Small World Underground can be played on its own or combined with other Small World game elements, as many of the Races and Sepcial Powers from the original game and previous expansions are compatible.