Games similar to One More Dungeon include Doom. It's paid, but Freedoom and Keep Out! are free. Other options are Wrack: Exoverse. In total there are four First-Person Shooters like One More Dungeon for Windows, Linux, the web and Mac.
Doom is a science fiction horror-themed first-person shooter video game in which players assume the role of a space marine, popularly known as "Doomguy", who must fight his way through the hordes of invading demons from Hell.
United States
Freedoom is a WIP a complete free content game based on the Doom engine. It's not an engine, but it's replacement game data with entirely original content, Compatible with a majority of game mods made for Doom. Comes in Three Flavors~.
Wrack: Exoverse is the follow-up to the 2014 first-person shooter Wrack. It was a very fast-paced, arcade-style game with heavy influences from classic shooters like Doom and Quake.
United States
An action-packed adventure playable for free in your browser. Explore the dungeon, fight monsters and unlock epic weapons.
France
EU
