"What with all the buried remnants of past generations, space in Small World is even tighter underground than above. Your ancestors' hopes for you to carve out an underground empire are in jeopardy. Others have dared to burrow beneath your land, leaving little space left for the living or the dead!
Small World Underground(tm) 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, Small World Underground also introduces Monster occupied regions that protect Relics and Places of great power! It can be played on its own or combined with other Small World game elements, and is recommended for experienced Small World players."