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

Underground (role-playing game) - Wikipedia

RPG Writeups — Ray Winninger's UNDERGROUND

Steam Community :: Underground Life

Battlelords of the 23rd Century (Military Sci-Fi RPG, 7th edition) by 23rd Century Productions, LLC - Galactic Underground 2 (6th Edition) - Gamefound

Underground rooms (RPG map) by ndvMaps on DeviantArt

Underground RPG - Underground - Noble Knight Games

Underground Waterfall, Michael Ghelfi

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

SAMP RPG Underground RPG [PC/Android] - Trabalho de Transporte de Dinheiro!

RPG Justice Chronicles for Underground, Press Release