Oxygen Not Included

If you are struggling with this game I recommend you to read "Fox and McDonald's Introduction to Fluid Mechanics".

Great game, mods have gotten better. Please please have mods tested at run. And recompile them with newer dll. If they fail the turn the mod off. Do not crash. Or lock out the game so frustrating to be playing fine then update comes in and I cant play for a month cause the mods don't support changes...

Say goodbye to your wife. Say goodbye to your children. Say goodbye to your life. This game will be your end. Seriously, this is electronic crack, I think about this game in conversations, drafting and re-drafting systems, moving things endlessly. The most fun I've had with any video game ever.

Klei Entertainment’s Oxygen Not Included is not your average base-building sim. It's an unforgiving, complex, and weirdly charming descent into subterranean survival—where every breath, calorie, and molecule counts. Whether you're a colony management veteran or a curious newcomer, this game will test your systems-thinking like few others. At its core, Oxygen Not Included (ONI) is about building a livable habitat for your “Duplicants”—clones crash-landed deep beneath an alien planet’s surface. But calling it just a "colony sim" doesn't do justice to the sheer depth of its systems. You'll be managing oxygen diffusion, carbon dioxide buildup, temperature gradients, plumbing networks, food chains, waste disposal, morale levels, stress reactions—and even gas pressure and fluid dynamics. It’s part city builder, part survival sim, and part chemistry lesson, all rolled into a charmingly claustrophobic package. There’s no hand-holding. The game throws you into the deep end—sometimes literally into pools of polluted water—and expects you to figure it out. Trial and error is inevitable, and so are spectacular failures (exploding toilets, heat death, mass starvation). But when your systems work in harmony? It feels like magic. True to Klei’s style (see: Don’t Starve), ONI’s 2D art is vibrant and full of personality. The animations are expressive, and even under intense pressure, your Duplicants are endearing—until one has a stress breakdown and vomits all over the power cables. The UI is dense, but once you understand it, it becomes an indispensable control panel for your complex space ant-farm. This game is ridiculously deep. Want to build a hydrogen-powered cooling loop using wheezeworts and radiant pipes? Go for it. Want to establish a slickster ranch to convert carbon dioxide into oil? Totally viable. Eventually, you’ll be building nuclear reactors and rocket colonies. And with randomized maps, custom asteroid traits, and dozens of viable build strategies, no two colonies play the same. The sandbox potential is massive for those who enjoy experimentation and iteration. Here’s the catch: ONI is hard. The early game is punishing, the mid-game is overwhelming, and the late-game is basically an engineering thesis. This won’t appeal to everyone, and even fans of the genre may bounce off if they expect a relaxing city-builder. It’s more Space Factorio than Stardew Valley. Still, the difficulty feels fair—like a puzzle you want to solve, rather than a wall designed to block you. Pros: -Incredibly deep and satisfying simulation -Charming art and surprising humor -Huge variety of systems and mechanics -Excellent sandbox and creative potential Cons: -Steep learning curve with little onboarding -Can be overwhelming in mid/late-game -Performance dips with large colonies Oxygen Not Included is one of the most intellectually engaging management sims ever made. It challenges you to build not just a base, but an ecosystem—a finely tuned machine where failure teaches as much as success. It’s dense, demanding, and deeply rewarding for those who love complexity. If you’ve ever wanted to manage a tiny society on the edge of suffocation with a smile on your face, this game is for you. Perfect for systems engineers, base-building addicts, and people who think thermostats are fun. Rating: 9/10

Ooops I guess I should probably review this game by now. I have been playing ONI since 2018. I have played many versions of this game and it just keeps getting better. I have never seen a Dev team so dedicated to adding fun improvements to their game after release! ONI in early access was awesome, but it is INCREDIBLE now. A complex game with so much to it, but you can learn and play at your own pace. I am not an automation game expert--I have learned a lot about automation game mechanics and have gotten more into the genre because of this game. In my opinion it is a very approachable game for folks not used to the genre--As long as you don't run out of any key resources for survival, there isn't a time limit (exception: the Prehistoric planet pack DLC). I am also a huge fan of the unique and diverse wildlife populations on the various asteroids (made more diverse if you have the DLCs too). I'll take all the Meeps and all the hatches. Thank you. Play this game.

The game itself is solid, and the art style has a lot of charm but the tutorial is lacking. Without clear guidance, you either spend a long while figuring things out through trial and error or end up relying on YouTube walkthroughs and the wiki just to avoid fucking over your colony.(most of them aren't teaching you about careful planning or something, it's about exploiting the game's bugs/glitches) If this style of gameplay isn’t for you, I’d recommend playing something else, cause this game doesn’t hold your hand

My partner refers to this game as my second job. 10/10. You're looking for interconnected systems, complexity, and iterating to find the most elegant solution? Buddy, you've found it. Others have said it far better than I could, but if you're into systems management and want to sink a few hundred hours into a game, I can't think of a better one to buy.

Oxygen Not Included, Clean Water Not Included, Power Not Included, Metal Not Included, Coal Not Included, Moral Not Included, Food Not Included, Body Temp Not Included If you think about it... there is not much Included in the game.

I really wanted to like this game after watching so many lets plays and reviews, but personally my hands on experience was really frustrating and surprisingly very underwhelming and boring. My biggest issues included the Duplicants AI being terrible where they continuously do really stupid things and not the things youve just ordered them to actually do, the dlc packs didnt add enough content or value to justify the price (where they could of just been free updates to the game) either and all throughout there is excessive amounts of useless information just thrown at you, where it felt like everything was made to be overly complicated for the sake of it. Looking back, most of my time in game was spent paused just trying to micromanage everything to prevent future issues from happening, while waiting around for something exciting to happen or for research to complete to unlock new items/structures that I was likely never going to use. I can see why others may like the game as its very quirky and in depth, but for me the negatives overshadowed the positives.

I do genuinely like this game and it one of those super addictive ones where several hours can vanish *hence the reason why i never got a refund for it lol) It only cost me 5GBP anyway so i suppose its not all bad. BUT there is a steep learning curve, There is no tutorial or guidance, you have to spend a long time on youtube and forums asking other people what they done and hope for an answer pretty quick so you can carry on other wise you can be overwhelmed rather quickly. Maybe this is the devs plans to keep it searched for and always spoken about in the forums and on youtube as people will always need to search for it when ever they want to play. I tend not to like games that i have to spend more time on google or youtube trying to find answers. I like a challenge but i one where it can all be done in game, not answers from outside sources. As i said its addictive hence why i cant get a refund but i have figured some things out and it is pretty cute but there is so much i cant work out why things are not being build when i have so many resources. I only had it a few hours and restarted several times already? lol

There isn't anything quite like this game. its a special mix of games like factorio and rimworld.

I love the idea of building a base underground. It got me addicted. However, there are 2 main reasons why I can’t recommend it. 1. There are literally hundreds of little behaviours that are not intuitive, not explained, and have no real-world physics relation. Many of them could even be called bugs. [i]For example the critter drop: You need to close the door when the critter is in the doorway. Then the critter falls through the ground. But it only works if there’s another door right below, and it must be a pneumatic door, not a mechanized one. That’s the kind of thing you have to figure out to build a functional, automated base.[/i] 2. The game is very, very poorly optimized. It uses 25% CPU power, whether it runs or is paused. This is the only game that makes my CPU fan go brrr. Now it’s summer and pretty hot in my room — it’s impossible to play this game.

Yes, this is a Colony Sim. It is a Base Building game. It is about Survival. It is about space and asteroids. And about discovering a lost old world. But most of all this game is about [b]Tinkering[/b]. YES, this is easily the number one game on steam about [b]Tinkering[/b] (new steam tag added). Do you have a calling for solving problems? Fix things? Tinkering until you achieve what you deem perfection? You maybe feel restless or even sad when there is no problems for you to tinker and solve? If yes and you play this game, the game world and its inhabitants will be your number one intellectual target whenever your real world seems good enough for you. Just cycle back to the real world when it needs your skills. Simple as that. I guess that periodic excursions to this game will probably keep aged [b]Tinkering[/b] neurons alive for a long time. From one Tinkerer to another, don't miss this out!!

The best I`ve ever played. Super fun, you will never get bored, and always have something new to try, and create your own unique design. Also the grafic of the game is something uniqe thats gives the game that special vibe to it.

I have a degree of mechanical engineering and can easily say Fundamentals of Engineering Thermodynamics was easier to understand. If you have struggles with the game mechanics, I would suggest trying this book first.

I have been wanting to play this game for years. (Ever since Markiplier's first play through.) I saw that it was on sell and finally decided to pick it up. I bought the base game but loved it so much that I decided to get all the DLC before the sell was over.

Yes, I recommend it. It is addictive. The game requires you to guide your little humanoid creatures (dupes) into building a base inside an asteroid. A player has a few things available at the beginning but the game requires that the player ramp up oxygen production, waste disposal (toilets), and food production. Energy and water sources also have to be found. The ultimate goal of the game is to reach the surface of the asteroid and leave it, but to be honest, I have never made it. I spent most of my time building my interior base and making it self-sustaining. The game is relatively easy at the beginning but becomes more difficult as a player builds more complicated technology. Base heat, pressure and oxygen production can become challenges. There is nothing to fight. There is exploration and problem solving. I felt pain when one of my dupes died--but that is rare. Have fun, but be prepared to sink hours into this game, if this is the base-building game that appeals to you.

It's a fun game but the management is literally driving me insane. I finish plumbing, wiring, and automating my base only to realize I've put the water intake pipe into the outlet pipes for the bathrooms. To undo this I have to deconstruct all of the incorrect parts, which dismantles everything, and so I have to rewire, re-plumb, and re-automate everything in the spots I deconstructed. Not to mention the time it takes for the little guys to actually do all of this stuff. I even started playing on sandbox because it was driving me so insane. It didn't help. My play time is 90 percent building and re-building and re-building stuff while paused in sandbox. There's just too many resources, too many liquids, too many ores and stone types, too many miscellaneous solids, too many different things to collect to build too many other things. Everything needs something different. I had a lot of fun, except for when I quit out of frustration a billion times after making a small mistake which ruined everything I had going, or restarted a billion times, because one small detail was out of place and I had to demolish so much stuff. Take this with a grain of salt though cause I have pretty severe OCD. My fiancee is playing it and having a good time, because he just builds whatever wherever and doesn't need everything to be pretty and perfect and completely optimized. but I have to uninstall before I completely lose my mind. So I don't recommend if you're like me, but most people will maybe find it fun? It makes me miss the simplicity of Rimworld though. At least they only have one liquid that matters (conquest!)

Its a great extremely deep engaging cute as heck game, after 40 hours i got frustrated then told myself id stop playing , then the next day i kept playing ,after 60 hours told myself its too complex for me, but then kept playing next day, now im at 90 hours and 10 hours of tutorials and its officially one of my favorite games of all time. My only grip is the game starts to get laggy once your colony expands, which is why i tend to give up once im near lategame.

one of those games that makes your brain feel like it's overheating – in the best way possible. There's a steep learning curve, and at times it can feel overwhelming trying to balance oxygen levels, manage resources, and keep your duplicants alive. But once you start to understand the systems, it becomes incredibly rewarding and oddly relaxing in its own chaotic way. The depth of gameplay and the satisfaction of building a functioning base make it hard to put down. It’s stressful, challenging, and at times absolutely brutal – but it’s also one of the most fun and addictive colony sims I’ve ever played. If you enjoy problem-solving and don’t mind failing a few (or many) times while learning, this game is definitely worth your time.

Good game, will become more complex over time and take more time to learn then you first thing. Don't free mistake as you can save as much as you want. And don't forget to restart if thing seems hopeless and use what you now know to do better. Experiment and experience success and failure is how you learn. Many more will suffer for my need to learn more, so others can prosper later.

It's a fun colony sim, not too difficult to learn and offers decent challenge ime

It is cute! Each phase of the game is fun. I like the beginning and I often start over. Lots of variety in world keeps things interesting and challenging. The whole community seems to be supportive. I run quite a few mods. Sometimes the mods become not needed cause the game UI improves at the source.

Fallout shelter pero mejor. Añadan multiplayer default, rancios.

If you're playing on PC it's amazing, but this game shouldn't be deck verified. The controls are abysmal, I feel adding real controller support would be required to enjoy this in any real capacity.

[h1]A Deep Dive into... Nothing: Why Oxygen Not Included Left Me Gasping for Joy[/h1] [i]Played for 8 hours. Gave it time, gave it effort, gave it a fair chance. Here's what I found.[/i] [hr][/hr] [h2]Who This Review Is For[/h2] If you're someone who enjoys: [list] [*]Complex systems that slowly reveal themselves [*]Figuring things out without help or structure [*]Succeeding through trial and error with a strong emphasis on error [/list] ...then this might be up your alley. But if you're looking for: [list] [*]A sense of progression or momentum [*]Systems that connect logically [*]Milestones that reward your time and choices [/list] ...this game might leave you cold. [hr][/hr] [h2]The Good[/h2] [list] [*][b]Looks and charm:[/b] Great animation, appealing art, and expressive characters. [*][b]System depth:[/b] There’s a complex machine under the surface if you’re willing to dig for it. [/list] [hr][/hr] [h2]The Problems[/h2] Here’s what made me step away: [list] [*][b]Awful onboarding:[/b] Mechanics around gas, water, and temperature are critical, but poorly explained. [*][b]Disconnected tech tree:[/b] There’s no clear direction. Unlocks feel random instead of strategic. [*][b]No urgency or drive:[/b] You’re not racing against time or survival. You just exist in a slow, static loop. [*][b]No payoff loop:[/b] Other games give you a “just one more thing” feeling. This one doesn’t. Progress feels like treading water. [/list] Even basic success requires watching tutorials outside the game. That’s not clever design. That’s passing the buck. [hr][/hr] [h2]Final Thoughts[/h2] I came in wanting to love this. I’ve played and loved games like [url=https://store.steampowered.com/app/294100/]RimWorld[/url] and [url=https://store.steampowered.com/app/427520/]Factorio[/url], and I’m totally fine with a steep learning curve. But this wasn’t a curve. It was a wall. And there was nothing on the other side that made the climb feel worth it. Maybe there’s brilliance buried deeper, but the game gives you no reason to keep digging. No sense of growth. No satisfying moment where it all clicks. Just more stuff to manage with no emotional or strategic reward. I feel nothing demonstrates this greater than the achievement tracking all those that payed this game and stayed to the ending. [h3][b]Final Verdict: 2/5[/b][/h3] [i]For players who love unwrapping puzzles with no clues. For everyone else, it’s okay to walk away.[/i] [hr][/hr]

Obviously a majority of the people playing this game give this game a thumbs up - given the Overwhelmingly Positive reviews on steam. I thought that this game would provide the same level of "time dilating" immersion I've experienced with Rimworld, it wasn't the case. My first three hours were slow, uninteresting, and all-around uneventful. Maybe I've been spoiled by Rimworld. But I just don't think I can enjoy this game. That said, if you have played and enjoyed Rimworld, I'd say its worth a shot - especially at sale price.

Super Fun Game I love the little guys and the animations!

Cute fun game. Challenges math and organizational skills.

Quite honestly one of the best strategy survival games i have ever played. Solving early issues like having oxygen, food, water and then fuel. Then realising they all create heat and then solving that problem before you cook all of your duplicates. Prepare to lose multiple play through s and then some more. End game you realise everything is basically a cycle, nothing is waste. Oxygen may not be included but a good time is.

just very fun and addictive. late game you can kinda just let it run in backround.

I've played 42 hours of this game in a week and I'm just starting to scratch the surface of the mechanics. 10/10 addictive as hell.

100 hours into this delightful biohazard riddled, suffocation imminent, Meep keeps peeing in my water supply of a game, and I still don't know what I'm doing. Totally worth the time investment!

I have a love/hate relationship with this game. I love it as it is fun and difficult to play, but that is also why I hate it. This game is incredibly fun to play, but is as difficult to play as it is fun to. That is what makes this a great game. Even though I have just made it past my first 100 cycles, even after 160+ hours of play, I will recommend this game to anyone who wants a game with lots of replay, fun and challenge.

I've played games all my life, I design them for a living, I'm not young. This is the best, most complete, most expansive and rewarding game I've ever played. By a distance too mind....

Not for the faint of heart: This game is one of my favourites of all time but man does it require a lot of learning. Either you have a STEM degree or this game will force you to learn. If you're not into back-breaking colony management, fluid dynamics and temperature control then this game is DEFINITELY not for you. Super appealing art style and has an interesting early gameplay loop, while the later stages of the game get a little boring if you don't know what to do. 8/10 Colony Management / Survival game

its an amazing game, been waiting years to play it and now that i have my own pc im enjoying the shit out of this masterpeice of a game

What a fantastic game. I played it a year ago on a free preview weekend, and I found the art style alone worth of a purchase and a play. It's a game that can drive you nuts (lots of things to understand, with a limited amount of hand-holding and explanation), but when it all works, it's a ton of fun and enjoyable just to look at. Pacing is pretty consistent, as is the learning curve, but there is a tendency for things to build up until it all goes off the rails right away, so slow game speed and frequent pauses are your friends. There are lots of great web walkthroughs and video tutorials, so if you're interested, take ONI on and dig into what the community has already shared.

you gotta study biochemystry, mechanics, engineering, biochemical engineering, and probably pluming too to be able to start playing this game, 10/10 very fun would recomend

amazing game and is more educational than you thought never thought id discuss hydrogen machinery with my buddies but here we are lol

I’ve played this game for 65 hours and found that I’m still at the “Intern” stage. Don’t get me wrong—it’s easy to play. You can clearly see the game’s goals and carry out your plans directly. But it constantly shows you that there’s always a better strategy—here or there. So you end up starting over, again and again, trying to build a “better” colony… even though deep down, you know there’s always an even better version hiding somewhere, just waiting for you to discover it later.

this game is so good i would highly reccomend this game to anyone who is into survival or base builder type games. oxygen not included is a highly well built game with a indepth and complex progression tree.

great game full of statistics to analyze and plan how to build the base, to not talk about the bug/glitchless native linux support.

If you can get into it, and figure crap out, it's fun.

[h1]Improvise. Adapt. Overcome.[/h1] Nothing come close to word uttered above other than this game. I enjoyed roguelike deckbuilder, i enjoyed farming sim, yet this game managed to hook me with cutesy artstyle but with brutal survival gameplay. Every seconds playing is all about problem solving and tackling it one by one. There are many days where my whole colony base go super stressed that i struggled to keep and finding quick solution for it This game should be praise because it is probably one of the best physic simulation i have seen in video game before where it is not just about physical form (solid / liquid / gas) but you have to learn stuff like thermodynamic, managing power grid, exploring dangerous biomes for more advance resources, all while trying to manage your colony so they doesnt ruin your progress (puke / pee in your fresh water source? that normal) Be warned that if you decided to play this game, you will restart your world multiple times until you find something you satisfied with and then maybe you can try to push more optimization in many aspect. I tried to play this game blind, but turned out that i missed many fundamental and progress much slower than normal people would. My first rocket was like at 1500 days when people couldve just easily reach it in 300 days. I finished the game like day 2500, which is about 300 hours, that is pretty dang slow if you ask me especially when i played starter world with survival setting. Cant imagine starting on harder planet. tl;dr my recommendation is to play the game blind until 100 days, then maybe read some sustaining early game guide, lastly maybe install some mods. the game will be much slower & tedious if you just tried to stick to vanilla (i did until days 1000 and regret it) *Also, the expansion DLC totally changed the game so if you go read any guide website just make sure it is about base game and recent, since there many outdated stuff out there. source : bought the game during KLEI sale alternative : terraria - although mostly the similar is just the digging & some liquid physic dungeons series - RTS with dual under / over the ground, managing minion to your bidding

When those little... "humans" need to create food but instead they choose to be idle. But I love this game.

It's a good game, except when you spent an unhealthy amount of time. And when the PC proceeds to take a numero 2 during END-game.

Oxygen Not Included - Colony Sim with automation It's a fun game, you manage oxygen, food, morale, and try to tame the surrounding. But it is far from being a simple game, and a lot of threats are ticking bombs you don't see at first. One of the first being basic food using water, but water is limited. If you don't anticipate, it will be very hard to fix this, you run out of food, your dups die. Same with temperature, with the heat generated by your machinery, if you did not anticipate, your bases and dups will heat up, and your crops will die. So you read guides to get better, and all of them are about bug exploiting as much as possible. Playing with gas and thermal conductivity is fun. Having to copy paste blueprint for maximum efficiency is not.

Such an amazing city-survival-base game. The real life inspirational science and the way you have to think make it challenging even in mid and late game. I still haven't made it to space...500+ hours later! Almost there this time (I think!).

Oxygen Not Included. An epicly named game for an epic game! It'll have you worrying about the future of your little underground base as you race to clean the air, separate gases, work out your piping and wiring system all while allowing your Dupes some downtime! It's a truly tough game with a steep learning curve, but once you get the bug, I promise you'll never stop playing!