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

Streets Tell Stories (Underground RPG: LA Campaign Sourcepack) [BOX SET]: Christopher Kubasik: 9780923763893: : Books

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

Pyramid: Pyramid Pick: Underground

Cloud Underground Incubator: The RPG of Life

Top physical games tagged OSR and Superhero

Battlelords of the 23rd Century: Galactic Underground 1 PDF – Studio 2 Publishing

PSI World: Underground Railroad

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

Best Underground Games

PF1: Underground Random Encounter Table – Jon Brazer Enterprises