Resistance underground (RPG map) by ndvMaps on DeviantArt

System Mastery 235 – Ray Winninger's Underground

Mayfair Games Underground RPG softcover 1993: Gamemaster's Pack

1993 Ad for Mayfair's Underground Roleplaying Game – BattleGrip

Human Blood Alliance RPG Blood Path Expansion World Book Underground File

Age of Ravens: History of Cyberpunk RPGs (Part Two: 1993-1994)

Fully Strapped, Always Packed RPG book gats and gear from the underground mfg

Underground Mine & Assets

My next game is a turn based RPG about a young child lost in an underground sewer system where strange fog is mutating the creatures and critters inhabiting the labyrinth : r/Unity2D

Fantasy Grounds - FG Underground Map Pack on Steam

Post-apocalyptic open world RPG Underground Life arrives on PC