Depends on what you like? I don't have a lot of obscure or niche games, but I've got plenty of good ones!

If you want an excellent narrative experience, we got stuff like Disco Elysium :evrart:. And, I'm not much of an RPG guy, but Earthbound and Mother 3 are my personal reccomendations for a slightly odd, sometimes bizarre adventure of trying to defeat the ultimate evil, and capitalism. :pigmask-parodied: Something more, fps oriented we got Fallout New Vegas, a bit clunky but it works well and has a butt-load of quests and narratives.

If you're more management minded, maybe something like Cities: Skylines (It has a sequel I haven't played yet) for cities, and lately I've been playing Rimworld which is focused more on creating schedules for individual people and designing a base smooth enough to survive/escape the planet. The Tropico series is good too, Tropico 4 is the best one IMO, a little dated but it is fun to try to get everything to click together in a game where nearly everything is working against you.

There is also the matter of Paradox grand-"strategy" games, of which I am an addict of. EU4 is good in itself (with all the DLC, so say goodbye to your moolah unless it's a sale) but also has an excellent fantasy mod called Anbennar, which is chock-full of content. But games like these have a large learning curve, not a hard one (pressing buttons on screens/map) but a long one (a bajillion things to keep track of).

The Total War series is a bit hard for me to recommend nowadays, as in my opinion, the newer titles lack what made the older ones special. But if you want to play some large-scale battles in rts with turn-based management of your realm? I'd say play Shogun 2, especially the standalone dlc Fall of the Samurai for some firearm focused action with sharpshooters and naval bombardments. Of the old-older titles, Medieval 2 is also really good, very charming, but has a very clunky control scheme that still befuddles me after 250+ hours. And my personal favorites, based purely off nostalgia and my undying love for the early-modern period, Empire and Napoleon are a fun time. Empire, albeit buggy, holds a special place in my heart. (Darthmod recommended after a few hours of gameplay for AI and graphical improvements + quite a few more units to mess around with.)

Also, don't forget Subnautica, a sure-fire way to make you afraid of the ocean as you explore an alien world, with both it's wonders and terrors. Of course, Minecraft is good for this also, Caves and Cliffs update made exploration so much fun. Another exploration and survival game I nearly forgot to mention is Project Zomboid, a zombie survival game (shocking), it is isometric where you have to manage your characters stats such as food, water, boredom and happiness while avoiding being bitten by the titular zomboids. It is fully customizable, so if the default gamemodes prove too easy or hard, you can simply change it.

Now, if you want to completely relax while doing some puzzling, Dorfromantik is a hit, a little hexagon-based matching game where you create a nice landscape as the game goes on. On the more intense side however, there's Teardown, which is a resource intensive game simulating a near entirely destructible physics based world. The thing doing the destruction? You, as you try to complete unique challenges, often timed ones, creating optimal routes to steal paintings by simply creating your own route through some richoids bedroom with a pipe bomb.

And for shooters... look up Cruelty Squad, there's actually a niche game for you. :john-cruelty: :cruelty-handler:

So, there you have it, my honest list of actually-good singleplayer games. I could write more, but that's a lot of Bideo James to get through. And some of them, especially the Paradox grand-strategy games, should be "loaned from random strangers on the internet" at first to make sure you actually like them (Cause DLC is expensive as hell.).