Games

• Oxygen Not Included

• Caves of Qud

• Fallout 4. A lot of this is going to be due to mods.

• Wargame: Red Dragon. Intended to be played multiplayer; I played it single-player. Steel Division II is a far better single-player choice if you don't mind the different setting, as the AI is much more interesting.

• Skyrim. A lot of this is going to be due to mods.

• Rimworld

• Civilization V

• Fallout 76, the only entry here I actually play multiplayer (and even that to a minimal degree; that game tends to have players having pretty minimal interaction with each other unless they're actually trying to play with each other). I would recommend playing Fallout 4 over Fallout 76 unless you specifically want multiplayer; Fallout 76 is just the closest thing to "more Fallout" short of a Fallout 5.

Not run through Steam, so no Steam stats (though available on Steam) but I'm sure that they're way up there:

• Cataclysm: Dark Days Ahead. Free and open-source, though there's a commercial build on Steam if you want to effectively donate. If not, can download from their project page.

• Dwarf Fortress. Free, though there's a commercial build on Steam with a fancier, more-approachable UI and such.

• Dungeon Crawl: Stone Soup, though that's going back a few years. Free and open-source.

Some others with a fair bit of playtime:

• Steel Division II. Primarily a multiplayer game, but I only play single-player.

• X3: Reunion

• Mount & Blade: Warband. The Prophesy of Pendor mod adds a fair bit of time to this.

• Elite: Dangerous. Though I don't remember how I accumulated that many hours. Wasn't super-impressed with the game. Probably pretty in VR, though.

• Stellaris

• Noita

• Kenshi

• Nova Drift

• Starfield

• The Sims 3

• Starbound

• Rule the Waves 3

• Wasteland II

• Fallout: New Vegas

• Carrier Command 2. Primarily intended to be played multiplayer, but I play single-player.

• Kerbal Space Program

• Total War: Warhammer II