I'm getting tired of games. Tired of playing the same garbage over and over. I have problems with even Sky Rim. It plays like a console game from years ago, and its level-up system is boring. I would barely know, because it didn't hold my attention for more than 5 minutes. Indie games were once all about innovation. But now we are in a "graphics matters most" age ... I end up playing kid's games, like Sonic, and at 25 years old, just because I can play them in a monotone way without ever really thinking.
Allow me to introduce NetHack.
For decades it has gained labels like the best game ever and the greatest game you will ever play. A frequent quote: "The dev team thought of everything."
About 35 years old, it still has occasional active development. Text based, but graphics front-ends exist if you really want them. RPG. Hardcore mode only (death is permanent). Single player, although you can find bones from past games.
Simple enough game in theory: Procedurally generated dungeon, roughly 50 levels. Roughly 5 side quests. Every detail of the game is documented online.
With everything documented online and plenty of spoilers, it should be easy, right? Nope. Many people play the game for multiple years before winning it the first time, or give up in frustration.
Some evidence for "the dev team thinks of everything":
Potions and alchemy: Dip your arrows in a potion of sickness, suddenly poisoned arrows. You have your traditional potions of healing and full healing. A potion of acid or paralysis is best when thrown at monsters, but in rare cases can be nice for emergency cures... Potions of water also can be blessed (holy water) or cursed (unholy water) which can help/harm various object as they become blessed or cursed, and affects monsters. Heal a friendly demon with some unholy water, or drink some holy water when you are cursed with certain conditions. You also get potions of polymorph, potions of fruit juice, and potions of booze. Ice boxes are normally used for keeping corpses and food cold, but some players will pack up an ice box full of booze for... well, their own reasons in the game.
Lots of magic. Have a pile of magic rings? Polymorph yourself into a metal-eating monster and eat some rings to gain their magic abilities. Or just polymorph yourself into a monster and gain their abilities like flying/floating, telepathy, fire breath, extra arms for weapons, and more. Polymorph into a female egg-laying creature, lay some eggs, hatch them and grow your own army. Spells range from spells of protection and healing to fireballs to the finger of death. Spells are best when you cast them, not so nice when you get attacked with a touch of death.
Many things have good and bad variants, and since objects are unidentified at first, you need to be cautious until you know what it is. You might have an amulet of lifesaving, or an amulet of choking. A ring of regeneration or slowed digestion can be good, a ring of hunger not so much. Stealth and protection are good, aggravate monsters, less good. Gauntlets of Fumbling or Fumble Boots are less than ideal if you want to hold weapons or walk. The bad items also generally are cursed, meaning you cannot take them off by yourself; find a priest or holy water or an incubus or other method.
Pets. Often you start with a kitten or puppy or pony. But you can tame most anything. Pet demons are convenient, a pair of succubus/incubus pets will seduce male and female monsters so they'll conveniently be naked (no armor) when you attack. Pet dragons can be fun. Pet angels, elementals, and assorted divine beings are also nice. A pet lich or vampire can clear out a level for you as you sit back with your ice box of booze. The ultimate pet is an Archon, basically an angelic demigod. Dual wielding, blinding radiance, claws, spell casting, regenerating, flying, nasty creature. Many arms so they can dual wield while holding an awesome shield. They can wear armor (gloves, helmets, boots) and can come with unique weapons (the unique Demonbane sword with +demon bonus or the unique Sunsword with +undead bonus). Other angels see them as a lord of their kind and do their bidding.
Pets can also be a problem. One time I had a pet gremlin. Gremlins are usually fun to have around when friendly. They can remove some problem conditions from you. They have 2 claw attacks and a poison bite attack. They are pretty speedy, somewhat magic resistant. They are inherently evil. They have a habit of jumping in the water to reproduce, which is the important bit of my story. Me and my pet gremlin went down a level in the dungeon. I didn't realize it was the Medusa's Island level. Being an island, the level is mostly water. My gremlin jumped in to reproduce. When pets reproduce, there is about a 2/3 chance their offspring will also be tame, so immediately I had about 5 pet gremlins and about 3 non-pet gremlins. Then I took a step, and all the gremlins jumped in the nearest water again, spawning a bunch more gremlins. Repeat with every step I took. Without thinking, in a matter of moments the map was filled with my tame gremlins and monster gremlins. Standing still they fought each other and spawned more gremlins. I couldn't move without stomping on a gremlin. Ultimately the gremlins filled the entire level, making movement impossible as they filled the board faster than I could kill/displace them. I will probably never tame a gremlin again.
Deities. Part of the game involves serving your patron deity, either lawful good, neutral, or chaotic evil. When you are in a bad situation and in good form with your deity, pray for help. Prayer can heal wounds, uncurse items, protect you for several turns, fill your stomach, and invite other divine help. Or you can offend your deity, and they can send demons/angels against you, blast you with lightning, and disintegrate your possessions. You can even change religions, but be careful about it. Don't piss off your god if you want to win.
So much more. Steal from shopkeepers, or train your pet to steal from them. Rob vaults. Donate money to priests/priestesses for blessings. Pray. Make burnt offerings at an altar to get blessings. Make out with incubus/succubus. Study spellbooks. Use a magic marker to write magic scrolls. Wish for items from genies. Drink from a sink (yes, it includes the kitchen sink). Kick down doors. Chop down trees. Dig new passageways and shortcuts. Pry off gems from a throne, or sit on thrones as they are magical --- maybe get a wish, maybe summon an audience of monsters, maybe gain some insight or royal ability, or maybe order a species of monster to a genocide death, thrones are great magical objects. Visit a beehive and eat the royal jelly. Get robbed by leprechauns and nymphs. Get punished with a ball and chain. And on and on and on.
NetHack is an RPG with a lot of depth, and they don't focus on graphics. You won't get endlessly headshoted by teenagers or cheaters, or listen to the steady stream of profanities from 12-year-olds. You will curse yourself for not remembering that you had an answer to a problem in your pack; death while carrying a scroll of genocide or a scroll of teleportation is frustrating, because you could have read it and potentially survived.
When other games fail, let NetHack entice you.