A downloadable toy for Windows, macOS, and Linux

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Tend a colony of bacteria. Poke them, stir them and make them sing their songs.

PETRI is an exploration of emergent organisation. Take some time to play, watch and listen to these creatures.


  • Code, art, samples: me.
  • Additional samples by:  Jade and a mysterious spirit.


  • Interact with the mouse.
  • Left click and drag to stir.
PlatformsWindows, macOS, Linux
Rated 5.0 out of 5 stars
Made withLÖVE
Tags2D, ambient, artgame, emergent, generative, Life Simulation, screensaver, Short, Singleplayer, Virtual Pet
Average sessionA few minutes


Download NowName your own price

Click download now to get access to the following files:

PETRI [win] 40 MB
PETRI [macOS] 42 MB
PETRI [linux] 37 MB


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is there a demo available to download because i cant buy it

(1 edit)

Hi, if you get me your twitter/discord (or some other place i can DM) I will give you a key

Deleted 258 days ago

this is just beautiful, i hate not being able to buy anything

I'll send u a key if you provide some contact info, since itch doesnt allow DMs :>

thanks a lot :DD my discord username is ElNico56#0201


Super interesting little thing! The atmospheric sounds really add to the sense of discovery, it's great!!

When I tried starting the game up, I received an error that said:


Cannot compile pixel shader code:
Line 8: ERROR: 'uniform' : non-matching types for uniform initializer


[C]: in function'newShader'
main.lua : 95: in function 'load'
[C]: in function 'xpcall' 

Tried restarting it but didn't do anything. Is there any way I can fix this? 

I'll look into it. It might be incompatibility with your gpu. Can you send me your specs?

Not sure where specs are but I think these are it? 



Really interesting and fun project

Can you please release a Linux version of this?


working on it! should be included with the next update.

Still waiting on that Linux version ;-;


Oh, I kinda forgot about this, I'm so sorry!

I have some free time so it should be up in the next few days!

Oh, cool! Thanks for supporting!


I added a version just now. It's a bit troublesome because you'll need to install the right version of LÖVE yourself. (I added a link with the install instructions) 

Let me know if it works, since i havent tested it.


Very nice toy, I could be fiddling around with this for hours on a tablet/mobile. Although I was hoping to see those violet cocci turn into Staphylococci and Streptococci at least! Sound treatment also quite nice.