Do you know any singleplayer games that are infinitely replayable?

Tons. There's an entire roguelike genre built around this; some of my favorites are Vagante and Streets of Rogue. There are games with procedurally generated worlds like Terraria, RimWorld, Dwarf Fortress, and Factorio. There are RPGs like Baldur's Gate 3 that have so many ways to spec your characters and so many permutations of how events could unfold based on what you did that you're unlikely to see them all.

Minecraft?

Hard to do better than the OG endless sandbox.

FTL. It’s a simple fun cheap game. Steam says I’ve played this for over 3,000 hours!

https://subsetgames.com/ftl.html#_

Rimworld, Terraria, Minecraft, Satisfactory, basically sandbox games, where each playthrough is different.

Obligatory Rimworld shout out.

I've dumped more hours into this game than the rest of my game library combined.

Edit: typo

Rimworld would be my top suggestion, as others have noted.

I picked up Old World (excellent native Linux support BTW) during this summer sale and have not been able to put it down. If you're a fan of Civilization style strategy games I'd highly recommend checking it out. I haven't really enjoyed a Civ game since Civ 4, and Old World feels very similar but fresher and with less jank. it's got a Crusader Kings style dynasty system with randomized events that adds a layer of role playing your leader and securing their dynasty through heirs you can train/influence.

As for the repeatability, Old World has tons. Each culture plays significantly differently, and each leader has different bonuses that encourage an interesting style of play. Games don't play the same because of the mentioned event system, but also because learning new technologies is "randomized" as well. New techs are researched based off a selection of 4 drawn tech cards once you finish a previous technology. The card system makes it so you can't just rush straight to archers and dominate the early game to snowball into a power house every game, but its not truly random so you can "game" the system in your favor to get the techs you want with the tools the game gives you through either unique leader powers, or specific governor roles for example.

The game is super deep while not being off puttingly complex.

I almost exclusively play single player games and honestly Elden Ring has been a huge time sink. There’s just something about mastering it that is satisfying. It has online features but they’re not required.

Minecraft, Hades, Solitaire, Civ, Gunfire Reborn, Vampire Survivor, Vampire Hunters, and Placid Plastic Duck Simulator,

My top ones I constantly replay are Factorio, rimworld and modded Minecraft java version, mainly because there's a incredible amount of mods For all of them, make themed runs for each one. Sometimes action adventure sometimes just pure automation.

Nearly 8k in Factorio and probably Minecraft, not as much in rimworld but only because I bought it about a year ago

RimWorld. shit can go crazy with the mods a available or just vanilla.

Xcom, xcom2

Hades

Doom and all the other doom clones? Prodeus, dusk, forgive me father, there's a lot

I think factorio is one, even when you launch your rocket (I have more than 100 hours and I don't think....) you still can restart in a new generated world and try do to it again in a better way.

I've played a lot of RimWorld, and I don't feel anywhere near done

Classic Doom 1 and 2. There's gotta be over 100 levels if you count TNT and Plutonia, which I think were sold as Final Doom? Anyway, if you just get the base games for 1 and 2, there are thousands upon thousands of community made maps, including some total conversions, so you can play new Doom content until it physically pains you to continue.

Of course, I feel obligated to mention that even though it would be super easy to pirate the WAD files and play with a free modern source port like GZDoom, like absolutely trivial to find copies of DOOM.WAD and DOOM2.WAD floating around the net, probably showing up easily on Archive.org, but... Um... Where was I going with this? Oh, right, don't pirate. Cheap on GOG last I knew.

Balatro

Kenshi is infinitely replayable, imo.

From the alternate starts, to the different ways you can even play the game (wanna be a lone trader, traveling from town to town buying and selling goods? Want to be the ultimate warrior who can go toe-to-toe with the Spider King? Wanna build a city/outpost where you can be totally sufficient and build up your own personal army to take over the world?), to the sheer size of the world. Plus all the awesome mods that can add so much to the game that already has a lot. You start off with your skills at 0 or in the low tens, and you will get your ass handed to you on an iron platter until you actually train up a bit; but even a high or max level character can still get fucked up by the wrong group of enemies.

I have mods that add a couple new factions (the fungoids are OP), flesh other factions out a bit more with more weapons and gear, and other building mods and some QoL mods so I can truly tailor my experience how I like it.

It plays kinda like an RTS with a mix of RPG elements.

Rainworld, Cult of the Lamb, Slay the Spire, Inscryption

For me, it's Grim Dawn, honestly. (And Diablo before that) 10 classes to choose 2 from means a lot of new skills and builds. Tons of random loot, but also recipes to make and collect.

I mostly play with mods now. Grim Internals, full rainbow, some rep and exp gain ones, and the Item Assistant. I play solo, and have enjoyed every hour of it!

One I haven't seen mentioned (at a glance at least) is Noita.

Getting the "false ending" is achievable with some effort, but I dare you to actually finish the game. And as far as replayability, you'll be hard pressed to have two runs that go the same. The amount of Butterfly Effect in this game from all the combinations and systems is straight up insane.

I really can't recommend it enough.

Slay the Spire

Some single player games I've replayed often that aren't roguelikes would be...

Dishonored Star Wars Knights of the Old Republic 1 and 2 Prey 2017 Hitman, but specifically the World of Assassination games Bethesda RPGs Grand Theft Auto/Rockstar, specifically for me 5 or Red Dead Redemption Dark Souls (I replay it on offline mode predominantly anyway) Dying Light Middle Earth Shadow of Mordor/War Halo MCC campaigns Mount & Blade series Katana ZERO Vanquish/other platinum games

4x games tend to be functionally infinitely repayable, since a single game often takes an eternity and there are usually many factions to play.

I particularly like sword of the stars 1 & 2. Honestly don't remember which I preferred but I know I got an insane amount of time sunk into both of them.

I am currently in my like 90th run of Subnautica. I'm doing an "All Cuddlefish, no native food, save the Sunbeam" run.

Honesty I'm shocked nobody has mentioned Tales of Maj'Eyal or ToME for short. Extremely deep roguelike with story and it is getting expansions ans updates all the time.

Also it is open-source, so can be downloaded for free, but I would recommend you also buy it in steam for instance to support it.

Risk of Rain 2 and Robo Quest are probably up your ally because you like Ultra kill

But if you want to diversify genre, here are some that I would recommend

• Card Games - Slay the Spire (Its like a card game and rogue like combined)
• Rogue Like - Hades is currently one of the top tiers in rogue like dungeon crawler
• RPG - Baldurs Gate 3, even if you end up finishing the game, how you ended up finishing it is what makes it so replayable. Each character has their own stories for you to uncover. Larian's other gem is Divinity Original Sin 2 too
• Sandbox Games - Minecraft of Terraria
• Arcade - Most arcade games are highly replayable because thats their whole selling point. Currently I am back to playing Temptest 4000
• Hack n Slash - Grimdawn, nuff said

The binding of isaac: rebirth and dlcs

If you don't mind top down colony managers, rimworld is an absolute gem. The base game itself is infinitely replayable because every game is basically a story. Think dwarf fortress with graphics (well, df has graphics now but). Also incredibly easy to mod to customize or completely change your game experience.

Look up project brutality or brutal doom. Those are great doom mods with a lot of fun gameplay. I used to play that for hours.

The Anno series is pretty cool. It's like playing crack. I've been playing 1800 recently and it feels like an instant classic.

The elder scrolls games are great for this. The further back you go the more replayability there is IMO. Morrowind is goated.

Dungeon keeper 1&2 are both a lot of fun, and have lots of custom maps. The original dungeon keeper even has a full engine rewrite which is really good.

If you want to try map painters, Crusader Kings 3, EU4, and Victoria 3 are all excellent and in depth games, with a lot of replayability stemming from all of the different ways to build up your nation in the sandbox.

Rimworld, dwarf fortress, etc. Have fun!

Risk of rain and risk of rain 2

What you are describing is essentially the roguelike/lite genre, lol. Search up some of that, see if anything looks fun.

Minecraft, especially with mods.

Roguelites in general. My favorite is FTL. Also has good mods.

Fallout: New Vegas, Caves of Qud, Project Zomboid, Minecraft, Terraria, Morrowind, Skyrim, Dwarf Fortress, Kenshi, Rimworld, Elden Ring, and so much more.

This list is GREAT ... but if you'd be willing to venture back to the late 90s or early 00s I'll offer you three more names:

1. Fallout 2
2. Fallout
3. Mafia

All three are open world.

Cataclysm Dark Days Ahead

https://cataclysmdda.org/

Zombie survival roguelike. It's free, open source, and a mature project.

How about a randomizer? Pick a game you like and see if there's a randomizer for it:

https://video-game-randomizers.github.io/rando-list/

Kerbal Space Program, for sure. Skyrim is another.

Basically any game that doesn't in itself follow a story, so you are the story (or make it). For me personally it's building and factory games, like Factorio, cities skylines (1 or 2), satisfactory, Kerbal Space program (1 only), Rim world.

This list is essentially endless.

Dead Cells! Made by a worker cooperative 🥳

Closest I can think of to infinitely replayable games are rougelike games like Slay the Spire, Peglin, Shotgun King: The Final Checkmate, Backpack Hero, etcetera, and sandbox games like minecraft (or Minetest if you don't feel like spending money and/or don't already have a minecraft account).

Though, with the rougelike games I mentioned, there are upper limits to increasing difficulty levels.

Have to throw CK3 out as my personal favorite grand strategy game (though EU4 and the like are other options). There's nigh infinite content in weaving the story of your family and realm, and mods add a whole new layer to it.

Anything with procedurally generated levels, like roguelikes/roguelites. I can personally vouch for the longevity of Slay the Spire, for one specific example.

Deus Ex

The binding of Isaac.

I've been playing it on and of since the flash game released 13 years ago.

For me Rollercoaster Tycoon 1&2. But you could probably throw most Sim Games into here like SimCity 2k 3k or 4.

Europa Universalis 4. And EU5 is on the horizon.

Definitely not like the games you've mentioned though.

I've been recently playing the "so called" sequel to ftl, ftl multiverse. I have gotten the standard and old secret endings, but there are hints of a third even harder to find ending.

For me, Noita. I don't recommend it unconditionally, but for me that game will forever be the only permanent game in my library. I expect it's possible that I could finish Elden Ring. I know I will never finish Noita.

For the most enduring single player experiences, you really should give some grand strategy games a try, like older Total War entries, Crusader Kings, Civilization, Swords of the Stars, etc. Stuff like Factorio or Cities Skylines can also become addictive, but none of these games is action oriented.

Also, Age of Empires 2. I haven't played 4 yet, but I think it speaks volumes that, at least on steam, AoE2 has more players at any given time than 3+4 combined.

Ziggurat might be an interesting pick, as it's a roguelike FPS with magic weapons, though it might feel super neutered compared to Ultrakill. Risk of Rain 2 is 3rd person and roguelike, so every run you start from scratch and enemies will keep spawning at certain intervals, but it's a fine shooter

Fallout 4 might have a rather clunky shooting, but if you get into it, you can spend many, many hours blasting a variety of enemies, finding all sorts of places and weapons. Skyrim is a close second, while better played in 1st person, it's medieval sword and sorcery.

Doom. No the originals. Doom, Doom 2, and Doom Final. I always go back every few years.

You can get hundreds of hours out of Binding of Isaac, easy

War for the Overworld (I have many thousands of hours in this)

Settlers 2 Gold

(Both the above have a lot of user generated maps, which has given them most of their longevity.)

Factorio

If you're into boomer shooters, you can't go past the original doom for infinite playability. Literally 30 years worth of user created content and mods.

Shattered pixel dungeon

Stellaris, Rimworld, the Sims, and a lot of stragedy games.

Many ppl suggest rougelike/lite and sandbox games I want to also add games with a good mod community and have a lot of side quest like Skyrim, they fit the replayability criteria because when it starts to feel the same can you add mods that change things up. I have done thousands of hours in Skyrim and never finished the main quest 😂 I think Balders gate 3 will also live for a long time. Many rpgs seem to get a lot of mods and games like Balders gate change a lot depending on what you do and how you play.

But you seem to want some kind of fps so warframe would be better, you can play alone or with friends. Just like ultrakill do you jump around killing, you can use, swords, guns and magic depending on your build (there are many). Doom would also fits your style of playing I think.

Otherwise management games is a time sinker. But most do not have fighting elements where you yourselves fight. Cult of the lamb tries to be all of it, it has action/fighting and management you can even decorate if you are into that. Pretty good for those who want it all. The devs still updates it too.

Borderlands 2 has a lot of replay potential without getting boring. It never plays the same way twice. The weapon drops are very different each time through. Don’t forget the DLC. The rest of the games in the series are fun too, but BL2 seems to be where it peaked for me.

Dungeon keeper.

Any of impression games latter worldbuilders (pharaoh, zeus, emperor)

Honestly, Skyrim. With so many great mods available these days, you can literally turn it into a whole different game. And with modpacks on Nexus, Wabbajack or similar sites, it's easier than ever. I'm just getting back into it myself after 3 years, but I'm still a big fan of getting into the nitty gritty of it and configuring everything myself.

X4 foundations and relevant DLC. I have multiple saves with over a year worth of playtime

My most played games outside of actually multiplayer games are arpgs. Diablo(mostly 2 and 3), path of exile, last epoch. Diablo2 and last epoch can be played offline, PoE can't. And yes, they're technically online multiplayer games but most people play them alone so they might as well be single player games to me. After that my most played games are RPGs and rogue likes. Plenty of good suggestions for that already

I put multiple thousand hours into Mount blade warband, Crusader Kings 2, Europa universalis 4, and more.

Shotgun King.

<3

The one I never get tired of replaying is Mafia 2. Maybe a weird choice since it's very linear and every play through is pretty much the same. But the story is just perfect for me. The gameplay perfectly suits the story, nothing especially clever, just well executed.

Then there's games like Binding of Isaac or Dead Cells where every play through is different.

Diablo 1/2

Strictly speaking about single player games, as in no rogue likes and such, Max Payne 2 is probably the game I played most times over the years.

Dyson Sphere Program is dangerously replayable to me. Hundreds and hundreds of hours sunk into it

I don't know how much is truly infinitely replayable outside of tetris, but for what it's worth I have 250 hours into dead cells and I still haven't beaten 5 cells or even reached the final biome. You'll definitely get replay value out of it, the game is fantastic.

Stardew Valley

Factorio and RimWorld immediately come to mind. Even with the base unmodified game, you’ll likely get several weeks of gameplay out of Factorio. Then if you dive into modding, you’ll never put it down. Multiplayer is really nice too. And their big DLC just got announced, and is planned to drop in a few months. So now would actually be a great time to dive in, because you’ll get access to the DLC about the same time that you’ve burned through the content on the base game.

Heroes of Might and Magic - the originals. Mostly 3, but any from 1 to 5 can do it.

6 and upwards, it's just pure Ubisoft enshitification. Can't even play them properly anymore due to the online component having shutdown its service.

I have enjoyed caves of qud. Feels like every run is brand new.

I’ve played Risk of Rain 2 on and off for years and I’m not bored of it yet

I was about to suggest "Balatro" but you don't want infinite dopamine game then play The Binding of Isaac:Rebirth.

I want to throw out Mario Bro 3, Tetris, Dr Mario, and Sonic Mania. Just pick up and go, no long term commitment, always fun solo but you can add a friend anytime. Simple but rewarding game play loop.

Just Cause 3, with the additional DLC. I've been through all of it three full times, slowly plugging through a fourth (when time allows)

Slay the Spire, with mods

Football Manager 2016 was the first version I tried. I put 1,500+ hours into it and only stopped because I decided to upgrade to Football Manager 2018. I'm on 2024 now at ~400 hours.