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A member registered May 05, 2016 · View creator page →

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I have listed all of the videos that I originally watched that inspired me want to try to make my own evolution simulator in the description of this video:

I hadn't come across any of the carykh videos until after the initial release of mine. These kinds of simulations have exited for a very long time (way before 2015) and there are tons of them out there.

It still works for me (I just tried it in Chrome and Safari). Which browser are you using and what do you see on your screen when you try to run the browser version?

Thanks for letting me know!

You can do that with a middle click

There's already a way to get it for free. The entire source code is available here:, so you can download it and download Unity (also for free) and build the windows version yourself.

There is a Windows version

It sounds like you downloaded the free Linux build instead of the Windows build. I think the download interface might be a bit confusing but you only get download links to the Windows and macOS applications if you pay $2 (or more).

Does this help?

The downloaded file is a ZIP file of a folder. You need to unzip that somewhere on your PC and then inside of the folder is an Evolution.exe file, which you should be able to double click in order to start it. Let me know if that doesn't work and if so, what happens instead of Evolution launching.

I haven't used the launcher myself but I suppose that would simplify all of this to just downloading Evolution through the launcher and then clicking "Launch" in there.  You could also try that.

So Windows 10? What happens when you try to launch it?

Which operating system?

The number of creatures is not decreasing, but they are slowly converging towards the exact same behaviour, so it looks like there are fewer individuals (since they are perfectly overlapping each other). I have seen this happen with certain simulation settings, so try changing the mutation rate, mutation algorithm and recombination algorithm. Are you using "Chunk" as the mutation algorithm by any chance?

Nope, not intentional. It's supposed to be a random sentence from the short story. Does that always happen for you or just once? :)

It crashes every time? Which platform are we talking about? (Browser, Windows, macOS etc.)

That seems to be a Unity limitation and only applies to the web version. You should be able to copy and paste hexagon locations in the macOS and Windows versions that you can download.

Yes, you can export your own creature designs and saved simulations on all platforms except for the browser version. There is an "Export" button when you open the list of saved creates / simulations.

Unfortunately, it turns out that in the vast majority of cases the noticeable performance drops happen because of Unity's physics system, which is single-threaded on the CPU and out of my control.

A special build of Evolution that allows playback of legacy simulation saves. <- This is the main game you want to play

The issue I noticed should be fixed now. Can you please try again and see if that was the same problem you were running into?

I just checked and there seems to be a problem with Safari. I'll look into it. Are you using Safari or a different browser?

Yes, you cannot save in the browser version. You have to use one of the downloadable versions for that.

You should be able to edit all of those settings from the pause menu during the simulation as well as the settings menu in the creature editor.

I switched out the character model with the most recent update since people kept getting genuinely frightened by the old one and that was never my intention.

There are librarians in some of the rooms. They are completely harmless and are also just trying to understand the meaning of the books. You can click on them and they will tell you what they know, though most of it is as much gibberish as you can find in the books yourself.

Which macOS version? I just tried it on 11.4 and can't reproduce any issues.

If you mean that you want to be able to edit the creature design after backing out of a simulation that you loaded from a file, that is currently not possible, but I already have it on my list of things to add with a future update.

You can use the "Export" button in the save file selection window to save them to an arbitrary location.

If you just want to copy the entire folder you can find it at
C:\Users\<userprofile>\AppData\LocalLow\Keiwan Donyagard\Evolution
or if you use a Mac
~/Library/Application Support/Keiwan Donyagard/Evolution

There should be two folders there: "EvolutionSaves" and "CreatureSaves"

There is no exit button inside of the application. If you hit the windows key it should bring up the taskbar where you can right click the application and then select "Close window"

Hi! Thanks for letting me know about the Twitter thing. I didn't know that I had to manually enable that option.
All of my contact options are listed here.

I generally do not license out Evolution to be embedded on any websites other than, though.

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That's awesome! Thanks for sharing

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I've sent an e-mail to support about another payout-related issue 35 days ago and a follow-up a week ago and haven't received any response other than the automatic "Request received" confirmation. At this point any response, whether it's a "we don't know when this will be fixed" or "sorry, we have a lot of support tickets queued up and we'll probably get to yours within the next two weeks " would be significantly better than nothing.

I'll gladly cut them some slack given their small team size and the current state of the world but this complete lack of communication for so long is quite frustrating.

That's awesome! Thanks for sharing!

The running brain design you made is great too by the way :)

The same piece of text can be found in multiple places in the library. The search menu randomly picks one of these locations each time you hit search.

You can verify that the text was actually in the book that you searched for before you searched for it by remembering the exact location of the page (hex, wall, shelf, book and page number). You can go to this location at any point in time, in the browser version or the offline version on any machine and will find the text that you searched for.

By "did it again" you mean you opened the menu and clicked search again?

That's awesome! Thanks for sharing the video!

As long as the mutation rate is greater than zero, there is always the possibility that a creatures manages to mutate its way out of a local maximum. I haven't seen that happen myself, but to be fair, the majority of my time on this project was spent implementing it and not experimenting with long-running simulations.

What I would recommend is to try to play around with different selection, recombination and mutation algorithms and to increase the mutation rate when the fitness starts to stagnate. The settings that lead to the most randomized simulation behaviour (which can be exactly what you need if you're stuck in a local maximum) are
uniform selection
uniform recombination and 
global mutation
with a  mutation rate of 100%.

As far as the network size is concerned, I have seen some very interesting results with networks about the size that you have chosen. Sometimes with even more intermediate nodes (but not with more layers). I haven't seen too many successful simulation results with very deep networks. You might get lucky and immediately start off with one that works really well, but it's a lot more unlikely than with smaller networks.

The network inputs include the average rotation of all bones which can give the creature some sense of rotation. Additionally, the creatures cast rays into the world in order to learn about the distance from their surroundings. Some of these rays have a fixed direction (e.g. up and forward) but one of them is controlled by a neural network output of the creature itself. It could therefore also use the information it gets from these rays in order to determine its current orientation in space.

Thanks! Yeah, a Linux build even existing is as much support as I can / want to offer for it. It also lacks some features:

Glad to hear that it works, though.