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

Resistance underground (RPG map) by ndvMaps on DeviantArt

Underground GM Pack - Mayfair Games, Underground

Corporations & Cannibalism: 6 Reasons to Play Ray Winninger's 'Underground', by Oscar, The Ugly Monster

DEEP DARK: An underground TTRPG micro-zine by Gallant Knight Games

Pathfinder RPG 2nd Edition: Flip-Mat - Underground City Multi-Pack

Underground rooms (RPG map) by ndvMaps on DeviantArt

UNDERGROUND: Ways and Means - Democracy City Sourcebook RPG Mayfair Games MGI

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

Base Raiders Fate RPG

Underground Labyrinth Of Makai Grail Quest 03 Game Book / Rpg - Solaris Japan