The Mines of Moria, by Sam Ruby (1985)
(3 ratings)

Mission 1: Project Volcano by Stewart Peart 1984

Muggle Studies by M. Flourish Klink 2012 (18 ratings)

Mystery Manor, by Dana Crane (2001)
(1 rating)

The Night Market, by Zinnia Demitasse (2022)

Nineteen by Elizabeth Sampat 2013 (1 rating)

Nothing But Mazes by Greg Boettcher 2019 (7 ratings)

Nova Heart or Don’t Be Standing Around While the Earth Dies Screaming, or: Who Is To Blame When the Owls Leave Candy Jail?, by Zenith J Clangor (2014)
(7 ratings)

Oh, Reader by Seb Pines 2020

Old Jim's Convenience Store, by Anssi Räisänen (2019)
(15 ratings)

On Optimism, by Tim Lane (2005)
(13 ratings)

One way out by Story by Steffen Görzig, Cover by Oliver Lindau 2017 (5 ratings)

The Open Door (remake), by The Glass Fractal and Tom D. Frost (2020)

The Ouroboros Trap by Chad Ordway 2019 (7 ratings)

Out of the Limelight, by Jonathan Scott and Stephen Boyd (1992)

Outside Satyricon, by Ben Sharvy (1993)

The Pilgrimage by Nicholas Brakespear

A Pirate's Pleasure by Lisa Fox 2019 (1 rating)

Plant the Bomb by SergeantFerb 2013

A Player's Heart by Melissa Scott 2020 (4 ratings)