I saw "Doom" and had to give a try. This is a fun, well polished mod that introduces some new weapons, new weapons skins, a different Doom style HUD, and its own interesting story. The difficulty is on par with main game Red Faction. The level progression is pretty intuitive. I did get stuck on one section but if I'd spent more time looking around I could've figured it out without watching a speed run to show the way. Based on the recording of my first playthrough, it took me about 1 Hour, 15 Minutes to finish the entire mod so it's a decent length and very doable within one sitting. Speaking of recordings, it does feature some copyrighted music that resulted in Content ID notices on my YT video (though not Copyright strikes). I highly recommend this mod for any Red Faction fan.