Gaming

Unorthodox game - Kenshi.

Your squad can be wiped by a group of goats. Enemies are hard to fight. But the more your characters get better at fighting, the game gets slightly easier.

And then you go to the fog islands..

Nethack, it's free, it's browser based and has enough plugins for different Styles of graphics, if You don't like the ASCII graphics and it's had a Lot of years of content to the point where just learning it takes forever

Also try tales of maj'eyal

Hades

It's keeps the difficulty fairly high but it also has options to add more to the difficulty in fun ways. And can make it absolutely insane if you feel like it.

Super Mario bros: The Lost Levels will chew you up and spit you out.

Baba Is You. It's easy to play and understand, fucking brutal the whole way through.

The Lion King. On second thought, maybe stay away from that one if you have anger issues…

Only got ps5 and Xbox unfortunately.

Try sekiro, one of my favorite games, good luck

I don't know if you'd consider it low skill, but darkest dungeon is pretty hard throughout. The whole premise of the game is that you're going to get messed up and it could be coming at any time. Even the boss fights I've won without losing someone have been rough and stressful.

Atomic Heart can be challenging. Fun game with lots of stunning visuals.

Control - the game isn't as difficult as something like Dark Souls but combat scales up pretty well. Even late game with upgraded abilities/weapons I've found combat to be less than forgiving -- Jesse is pretty powerful but can also get one or two shotted if you're not careful or economical with abilities and ammo.

It's available on PS5.

boshy

Frostpunk

Look into Paradox games like the crusader kings or hearts or iron series. They have so much complexity that they're as difficult as you want to make them for yourself. They're so slower paced and less reflexes based than say dark souls or some of the aforementioned rogue likes.

EVE Online, definitely

Darkest Dungeon

I've been really enjoying outward. I guess it's kind of souls like in combat(?) I'd heavily disagree though. But it's been really fun for me lately.

Rimworld

Natural Doctrine. Tactical Game, turn based as in Your turn and then enemy turn.

High difficulty as you can't rush anything, one character dies and you gotta restart from your last save. Enemy is unfair as they will camp choke points and lure you close enough to then pound that one character that is too close. movement is a grid system but at the same time your position in that grid can affect your chances of victory. Line of sight is very important, as if you can see them they can see you making cover hard to use and needing to hug walls very important. Learning curve is high as they don't explain advance techniques but still allows the enemy to utilize them against you until you figure it out.

Game pisses me off to this day, originally released on PS3 but it is one of those games that makes you take your time to plan 20 steps ahead before you move. very satisfying to complete a level.

dragons dogma.

easier than dark souls. challenging the entire way through. you really only get super strong in the last 5%, unless you intentionally try to break the game from the start.

Phoenix point my guy, I’d say the game stays difficult throughout your play through due to enemies being able to evolve based on your play style.

If you have a switch, Celeste can be pretty damn difficult. They keep a kill count for each level of the game you go thru lol

Chess

Dungeon of Naheulbeuk keeps the difficulty high. There are different difficulty option. On the lower option it is challenging but you can do it. Same game mechanics like xcom

I think many people already gave you great reccomendatuons.

Darkest Dungeon is fames for being hard. As it is a turn-based dungeon crawler/management it's difficulty stems entirely from your own strategy and knowledge and the fact that no matter how buff your characters get, a strategic mistake or a few unlucky hits will quickly put you in your place.

Frostpunk, what other city manager has a fuckin' boss music? Similarly to This War of Mine you never have enough of everything. Your town is always one gone-wrong incident from chaos and something will always go wrong.

Darkwood if you like horror games it's an underaprieciated gem. You do get better gear as you progress but the game does a good job at keeping things engaging till the end.

Most games have difficulty settings

Age of Empires (or pretty much any RTS game.) Stays equally difficult all the time. You don’t gain an advantage with time. Start on easy and work your way up to harder difficulties.

Man why mention this war of mine, now my autistic ass has to hyperfixate on it for the next month.