A downloadable game for Windows, macOS, and Linux

[Version 4.5.3]  [release date: November 6th, 2017]

Submachine Universe is probably the first ever MSO (massively singleplayer online) created in 2010, extended ever since. You can freely travel between different locations, read theories about Submachine and observe how things work inside this network. There are locations that you might recognize from previous games, there's a lot of new yet undiscovered content, there are even locations that you think you know, but they're somehow different. Surely worth a look. The best part - it's an open project, which means I can add more locations later on and it will all work together smoothly. So, tinfoil hats on and start exploring if you dare, because there are some dark places inside.

[meanwhile, seven years later...]

In January of 2017 this project stopped being "free online" and morphed into "free downloadable", and here we are.

Please keep the file structure exactly as it is after unpacking. The main game file (subnet.exe / subnet.app / subnet.swf) needs the "sub_loc" folder along side it in order to work properly. Otherwise you'll just get a black screen after hitting the play button as the game won't be able to load any location ("sub_loc" folders contains all locations of this project).

If you downloaded a new version and want to use your save file from previous version, you have to keep the game in the exact same folder on your hard drive as the previous one. I know, it's kind of strange, but hey, there's flash for you. 

If you feel like it, maybe consider supporting it on Patreon.


Please also notice that this is work in progress. 
It doesn't mean that it's unfinished, bugged, or pre-alpha. On the contrary.
It only means that it's expandable, and new content is being added regularly since June of 2010.
That means new locations, new puzzles, new storylines might appear in the future.
Check back from time to time to see if there's perhaps new version of this Universe for you to discover.

Submachine Universe is a companion exploration project tied to the Submachine series of point and click games.



Before comment: please make sure you don't spoil any locations to other players. Don't post location numbers, ok? Thanks!

More information

Published Feb 13, 2017
PlatformsWindows, macOS, Linux
AuthorMateusz Skutnik
Tagsescape, Point & Click, PuzzleScript, skutnik, submachine
Average sessionA few hours

Install instructions


PC: Download, unzip, open .exe file.


Mac osX: Download, unzip, run .app file.


If you encounter any problems (like "damaged file" prompt):

read the mac_troubleshooting.txt that's in your downloaded zip. 

It covers most known issues, all of them are just osX trying to block Flash from being opened...


Submachine Universe for PC (.exe) 74 MB
Submachine Universe for OSX (.app and .swf) 86 MB
Submachine Universe for Linux (.swf) 70 MB

Development log


Log in with your itch.io account to leave a comment.

Viewing most recent comments 5 to 44 of 54 · Next page · Last page
(Edited 1 time)

Now I have soap×2, weight companion stone, piece of chalk, tile B and tile C.I don't konw how to use them. I also don't  know why there is Japanese in location 314. It's we Chinese calculated π exactly long long ago, not Japanese.

items: wait for next update (December 20th)

314: point me in the right direction of Chinese symbols for this (preferably a similar image). 

(Edited 1 time)

Thank you for your reply. I have played your game since sub1 in 2007. It's difficult for westerns to difference Chinese and Japanese. I like sub4 best.

Sure, but can you show me the chinese symbols?...

Centre is 圆心  Radius is 半径  Diameter is 直径 Circle is 圆周   They are similar to Japanese.

thx :D

changes implemented.  :D


Sorry for posting locations. But you're doing a good work with your drawings about Submachine. I like your games and these updates are just amazing for sure and I hope to see more games from you.

I had to make an account here for the sake of this, just wanted to express my journey with the submachine.

It has been a long journey, and as the first three submachine games were released, i randomly stumbled over it and it baffled me, the desire to explore/escape into an endless layer of confussion and still to the very end, it all made little to no sense as if regardless of years of knowledge we never fully understood it's universe. This game has been a place for me to escape, *ironically* my own little submachine. IT is truly one of the greatest game and concept i have played and seen, it is facinating in so many ways.

I don't know where you got this crazy idea to make this game, Even buyed some of them even if i had the option to not, you deserve it. I want to thank you for sharing this amazing world of yours. and i hope to see more games from you, and i will keep supporting. Also cover front was also a really good game i enjoyed allot

Thanks for reading this, keep up the good work :)

Thank You.

And yes, more submachines coming up later on.

Hi Mateusz,

I have High Sierra running but although I managed to change to "Anywhere" it tells me: Cannot open, throw away!

What can I do?


move it from downloads do applications

(Edited 1 time)

The Crecy Evaluationen I could play now. Very good! :)

Unfortunatly, it didn't work with Submachine Universe. :( 

I presume you are on Mac? When all else failed, this is how I got it to open for me, it might work for you. Open up the "Terminal" application. Then find "Submachine universe" in your files. Right click it and a list of options appears. Click "Show package contents".  A folder called "contents" should appear, inside that folder should be another called "MacOS". There should be only one file in there called "Flash player".  Drag that into your "Terminal" window and then press enter.  Submachine universe should start up with no issues. And then, if you ever wish to play it again, you don't need to do that full song and dance every time.  After your first time doing this, you need only press up while in terminal to see what should your most recent command, opening submachine universe. From there press enter and it should start up again.

Wonderful, Wizwardicuz! 

It worked! 


Thanx a lot!

I just wanted to play it now, but there is only a black scene. I can go back to the menu and I hear the sound, but can nothing do there. Does the game begins like that? Or is something wrong?

I can tell you right now, that's not supposed to happen. How did you try opening the game? Because , personally, I have never had that happen using the "Terminal" method. It does happen sometimes when I use use the SWF version.

Hey Mateusz!

Was just wondering, will there be another update before the end of the year?  I have been "saving up" the last few updates for a larger play through over the Christmas break, but wanted to make sure I wasn't waiting in vain!

(Edited 1 time)

yes. Hold on a bit more. If you have saved few previous expansions, this one will be epic for you. ;)

Oh, sorry. I meant that "cave-in" is a blockage. I didn't mean to remove a location, I meant that the "cave-in" is a blockage.

Qh, get it. :D

does the game start completely blacked out 

No. Are you on a Mac?

Move it from Dwonloads to Applications, please.

So, as I perused your lovely game, I noticed something... a little odd. In the theories that litter this game, you leave hints for locations, but only ever at the end(presumably so people aren't forced to read theories). In fact, location coordinates are redacted in the theories themselves, except for one. In location 051 there is a theory that mentions the locations 947 and 553. The fact it does this is odd enough, but what makes it even odder is that all the other location codes are redacted. So, I have to ask, was this intentional or did you just miss these two in what is certainly a very long theory?

that might have been missed. :D

Thanks for the heads up, will blank them out with next update.

I'm a Mac user,  and the game is working perfectly :)

I also check for updates what version has released later and want to see the new locations on the Submachine Wiki. So what is the new 5 locations?

hey, i know a few of the locations. if you are interested knowing them

Please don't post any locations in comments (to prevent spoilers) ;)

sure thing. btw are there any other big games that you may or may not be releasing in the future??

I regularly check for updates to Submachine Universe. All of your games like these make me so happy! There are all sorts of click escape, exploration, or puzzle games out there, but when I first found the Submachine games, I was in awe. I've played them several times over, and only looked at walkthroughs after hours and hours of being stuck. Thank you so much for making the games that you do. They're more than just games, they're an experience, and i try to tell people to play them whenever I can bring it up.


Hold on, new update coming out this week. And yeah, I know it's friday. ;)

(Edited 1 time)

I remember playing submachine with my friends in middle school and talking to each other about things we discovered in the game, like a hidden room, etc.  I recently bought and played all the submachines and almost broke into tears by the nostalgia and the emotions. All the Submachines, especially Submachine 10 The Exit are definitely the most beautifull and emotion provoking  videogames that i've ever played and the music fits so well. I can't wait for more to come.  Thank you. 

I don't realy know where to post this so i guess i'll just post it here. hehe, i saw a comment section and i thought i would leave some thoughts.


Thank You. :D

More will come, as well as remakes of old ones, redone in newer engine.


  I don't even know what to say right now.. Your video games defined my childhood. I remember being in the first grade playing Submachine and knowing the layouts by heart. And to this day, I still go back to them, to walk in the footsteps of my childhood overtaken by nostalgia. You are a brilliant developer and I look forward to seeing more from you in the future! :D


hold on, there'll be more submachine still. :D

Hi! What about Submachine for Android?

Not happening, afaik.

WOW, that's the game I played since the first episode.... congratulations Mateusz, your games are something special, good luck with next work and... can I ask you 2 questions?

> Will you release covert front 5?

> And.... Submachine Engine?

1. No.

2. Yes.

Hi Mateusz,

Thank you for creating this amazing experience! I love the Submachine games, and have been playing since many years now after first stumbling upon it while looking for awesome ways to procrastinate.. So I downloaded submachine universe and it would only play thru the browser on my Mac.. but I cannot figure out how to save and return to where I last left - I have to start from the beginning all over again! I am going crazy after doing that twice already at work (heheh) please help! how do I save my  progress!? (by the way I am not very tech-literate so if it is possible please tell me step-by-step what needs to be done!)

Thank you!

the game saves by itself. However, since it's flash, it's kind of obsolete and new operating systems and browsera might block it's ability to save.

Check your local storage settings for flash allowance. 

Nothing works :( I guess I will have to take a day and explore the whole place in one go!

or wait until it's all done in a better engine. ;)

Mateusz can you help me, i've installed the mac version of the game and I got the iSwiff app too. So I open the game and I got a black screen, the sub_loc file is in the zip but I still can't play the game, can you help me?

I've got some screen shots if needed.

btw I'd love to know how you even make your games, you inspired me to make puzzle games! 

try opening it via browser (just drag the subnet.swf file to it). then set it to fullscreen (your browser) and you're set to go.

or wait until I port this all to the game maker, since flash is kind of obsolete by now...

thanks for helping me it worked!

Mateusz, I'm having bit of a problem downloading and playing the new updated version. I downloaded this new version, put it in the same folder as my old version (Does it need to be out of the folder it downloads in or does it need to stay in the folder it downloads in but put that folder in the folder with the original game? Confusing I know sorry.), and then I try to play it but I get an error saying the download is broken or that it's not a complete download. I'm using the OSX version. Any help would be greatly appreciated. Thanks!

(Edited 1 time)

try redownloading again. And the using swf files (in your browser) instead of .app files. I know it's confusing, I can't wait till we ditch that flash version as well...

Thanks, got it working after some organization of folders and files. Ran into an issue with my inventory (Notebook and items I had collected) had disappeared. So I just restarted with a new game. Took awhile to get through everything but I'm pretty sure I'm as far down the road as I can be now. Thanks for the help though really appreciate it. I hope I have everything that's been added so far. Soap x2, Piece of Chalk, Copper Plate, Sigil, and Companion Cube. 

PS: I love the Portal references. Portal 1 and 2 were some of my favorite games.

Mateusz, give me the answer please. Why I need 2 soaps, piece of chalk, bell cube and weigth companion cube? I have found all locations.

P.S. Is the Sub10 real end or it's just picture with script gollographic Murtaugh's hand.

P.P.S. I am Russian. I am sorry for any mistakes in words and phrases.

Thank you.


those items don't have any use for now. they will surely be usable in future updates.

sub10 is the real end. But there will be more, just not murtaugh-related.

(Edited 1 time) (+1)

One more question. You create ISubmachine for IOS. And why you delete ISubmachine from appstore? Why you don't create Submachine for Android?Steam subeWhat the first Submachine on steam???

iSubmachine was created in 2008, almost 10 years ago. And it was for iPhone 1 or 2...

It's completely unplayable and obsolete by now.

"Submachine: the engine" will be he second game to come out on steam. First one is not submachine, but the big game that I'm working on right now.

hey mateusz , i just wanna know in sub : uni if i ran out of clues i mean the location numbers do i go to random place (like i always do) or what , when i play this game and stop at some point i feel stupid do i miss somethings or it's just like that....

(Edited 1 time)

but did you find them all?

It's the main goal of this "game" - to explore the subnet.

No other particular task at hand. :D

besides - you sure you got all the clues? clues lead to about 95% of all locations. the rest is guessable by household 3-digit numbers, like 666 for example.

So basically when i start playing i bring a notebook to write the numbers and when i go to each and every one of them i write the next clues until the numbers stopped then i get confused between the places that i think i left something undone in them , but if you think that i didn't saw other things or clues, i'm just going to replay the game to know what i missed !! thanks in advance

Can I transport the save files with me?

I made an account just to add a comment here,

How do updates work?

I love your games so much, i recommend them to anyone who says they like online puzzle games, so I want to update this at every update.

Will i have to redownload the game entirely every time?


and keep it in the same location as the previous one in order for the save file to work.


I downloaded the PC version, I open it and click new game, and all I get is a black screen. I don't know what to do, I really want to play it. 

make sure the sub_loc folder is in the same location as the .exe. They both come in the same .zip.

Yeah, both are there, but it still isn't working. Also I am so happy you responded to me, I've been playing your games for years, and you make my favorite point and click games. The stories are always so interesting.

I may have found a froblem, actually, two problems:

So in the root (552)'s online version, the lamps are lit up, and the "secret" part behind the lab portal should have a karma portal leading to "pbu", but that doesn't happen in the downladable bersion.

Tha other problem is in the Resin room (cat), for some reason, I can only access 3 of the 11 screens in it, making it impossible to reach "ael".

I haven't played 4.5.1 yet, but I hope you fix these soon!

in 552 you need to activate that pedestal. with something.

in cat, you also have to activate the door with something.

not saying more because <spoilers> 


So why not have an online version as well as a downloadable version? Have the online version and give the option to download the version to a computer, make them both attached so when the online version is updated, the downloadable version is updated at the same time. It would just be easier for people who don't want to continually download something over and over and over again. Just a thought, Mat.

(Edited 1 time)

I downloaded the Mac version and was wondering if I was just stuck or if there really is only ~45 locations. I noticed several things that were different than the last time I played this (back when it was on your website) but wasn't sure if this was the most updated version. I'm probably just being paranoid though, I easily could have missed something. (Edit, yes I was paranoid)

I had just updated  and I went to 629 via a lab portal and pressed the red button to go to 628 and all I got was a black screen? After resetting my save (All those precious hours, lost!), when I went back to 629 by the same method and pressed the button again, I was placed in front of the portal of 628. However, when I go to 628 first and press the button there, I can switch to 629 and back without landing in front of 628's portal. I know the the black screen thing is a bug, but how much of the second thing is intended?

(Edited 1 time)

I'll look into this.


Ok, I fixed it, thanks for bringing it up to my attention!

another question: in submachine 10 what can i do with the spoon and the four stone cubes ?

Go to the Portal and click  1 0 0.
At the bottom of the tower, go right 3 screens and into Storage Unit 33/2. Assuming you have all 4 Loop Stabilisers in order to enter Level X, scroll through the rooms until you find a gray 5x5 grid, which has the corner squares.....missing.
OK Osmking, that should be enough info for you to meet your goal. If not, I also teach Remedial Classes (haha) in solving the countless puzzles in the SubVerse, if you ever need any help in the future. I enjoy helping others who are stumped, so don't hesitate to contact me.
SDRanger (Profile also found on Submachine Wiki)

(Edited 1 time)

Set the Spoon on top of the padded pedestal in the
bottom right - most room in H E L L L L

(You'll get nifty surprise reward!)

   Another quick note regarding the puzzle-question you asked Mateusz directly, here, (and I don't mean for this to sound condescending, so please don't take it that way...I am just giving you a tip, from a little bit of my own personal experience over the past 10+ years, and from years of my constant observations.)  I can guarantee you, and bet money that I will never have, that Mateusz won't be answering any questions with the nature of: "Where do I find all 5 of the Vector Finders in Sub 10: The Exit?"  Once you get to "know" the guy, meaning, once you become more aware of the colossal amount of projects that he manages to constantly pull off simultaneously....(and 99.5% flawlessly, to boot!) you'll understand better that he simply doesn't have the spare time to help everyone who gets stuck on a puzzle. (There are countless thousands of us who do at times, too!)
   Further, when he hasn't answered questions of this nature for you in the past, don't take it personally! He's not being rude. He is seriously one of the coolest, most down-to-Earth artist/writer/gaming developers that you'll ever know, and he still takes the time to listen to his countless followers, our suggestions for his future projects (when he asks us, a few times a year.)  And he still understands that most people can't afford $39.95 for one freaking video game! He hasn't "let any of it go to his head", even after his constantly increasing popularity, his many awards, etc.
Like I said in my other reply though...I'm here to help whenever you get stumped. I have plenty of free time, as I am nowhere near as talented as Mateusz. haha
(see profile)

I'm sorry SDRanger for the very late reply i'v been busy and thanks for the info i didn't know where to ask so i dropped it here , i know that MS is working hard to make his games perfect and i'm looking forward to his next updates on his games but he make them very hard that i dislike going to youtube to walkthrough it hh talk later!!

I'm not answering "walkthrough questions" out of principle. 

I'm sure you can find a written walkthrough somewhere on the net if you don't want a youtube let's play, or you can join the submachine forum and get your answer directly there.

But I'm not solving nor spoiling my own game, oh no. :D

Hey, i just want to know what's the time you take between updates, thanks.

depends on complexity of locations.

So - hard to tell really...

Holy crap, I remember playing this in browser games forever ago! Surely its older than 7 years right?

You might have played one of the older Submachine games; the first was released in 2005.

(Edited 1 time)

Game contents unable to load: I am using iSwiff on OS X Sierra, and I put swf file and sub_loc folder in the same folder. The game can open, but when I click "new game", nothing appears but a blank black.

PS. the app file does not work, even if I allow apps from "anywhere" in security setting.

try opening main file swf in your browser.

black screen usualy indicates that sub_loc folder was moved away from the main file (it can't find a location to load).

Seems to me Sierra is still throwing hissy fits concerning security, preventing loading files.

Thanks, browser works. Any idea why iSwiff doesn't work?

Not sure. But there are issues with Sierra and it's gatekeeper. I'm having trouble with that even when using game maker and creating signed and approved apps. :/

This game will receive actualizations brief?

this is tricky. List of changes is a spoiler for the game. :D

Viewing most recent comments 5 to 44 of 54 · Next page · Last page