You can! World of Goo stores particles in the file properties/fx.xml.bin (not in the res folder) and you need to overwrite that file in a goomod. How exactly you do it is too complicated to explain here, but check other goomods' merge/res/fx.xml files to see how they do it! (Mods like The Unknown World did custom particles, so you'll want to look at those)

well im looking for a way to make custom particles MYSELF. i dont know how to animate it.

That's what I suggested. If you wanted to make water dripping, you could copy something like the goo drip particle, change the image to water, and tweak the numbers to get the animation right, YOURSELF.
Edit: The alternative to this is to just write it all by hand, which is about as hard as it sounds.

I mean theres nothing that will let me tweak or edit a particle effect... So this is confusing. WOGME only lets you do cutscenes and anims, WOOGLE is self explanatory, and same for WOOGBE.

(BTW i got a captcha to post my message that is out of the ordinary...
Here is the funi captcha

You need to edit the actual XML files. This is why I recommended taking a look at other goomods, so you can see where you need to put your files (and what to put in them)

|EZ PEASY. this will be ok to edit for me i have seen other XML files in other games too.
and i have seen some from WoG so ok. also do you enjoy the funi captcha

(Protip: caca in spanish and romanian (i am romanian) means "poop")

Wait theres a problem, i cant find the particles XML's
Edit: nvm im dumbbbbbbb

Here's a guide as to how particles work.

While it's always good to check goomods when uncertain as to how to do something, I don't think that's the best idea here. What I would do instead is use gootool to decrypt the particles.xml file (and the resources.xml file as well, if you're adding any custom images). You can look through the existing particles, copy a preexisting one, and tweak it until you have the desired effect. One done, you just need to encrypt the files and you should be able to use your new particle.

Also there's no particle editor, so you'll need a text editor if you plan to create particles.

ok, one more thing, how does the pipe get animated with the dust coming in and it growing and shrinking and stuff?

Interesting question. I checked the anim to see if there were any pipe animations, but found nothing. So the way the pipe scales inwards and out when active is probably hardcoded. As for the pipe, while initially I thought it was a particle, the dust by the pipe moves inwards, which as far as I know isn't exactly possible with particles. So that's likely to be hardcoded as well.

so ig half the things in the game are hardcoded bruh
anyways..
im wondering how many particles are there...
INCLUDING hardcoded ones.

Since I've no idea how to decompile the game, I've no idea how many hardcoded particles exists. However, if you check out this page you'll get a pretty good idea as to what particles there are in the game.

ok. anyway, new level uploaded. also, is there like any way to make your own particles with your own animations?

Particles have <axialsinoffset>, which is basically the same as <sinanim> that gooballs have. It would allow you to change how particles move along a certain axis. If that's what you're talking about, then yeah you can absolutely create particles with their own unique animations. I would suggest though that you get familiar with sine curves, just so you get a better idea as to how that would affect the movement of the particle.

But if that's not what you mean, then you probably want to know that animations are used to apply things like translations and scaling to scene layers. Think of the trees in Blustery Day or Fisty in Fisty Reaches Out (which is kind of a special case considering those animations aren't located in the anim folder)

Hello
I have a doubt
Why does WoG crash when I put a custom image?

a bit off topic but thats probably a bug with your game, or something my brain is too small to recognize. Try sending any error it tells you... or else, try putting another image, i put hundreds of custom images in my WoG and i got no crash, i suggest you may reinstall, or make another copy (reinstall or copy the gootool version!!! dont do it to normal one)

edit: i found out my link is exactly 182700 LOL

I mean a custom particle image made by me crashes the wog

i make mine with paint.net so i dont know what is wrong with yours... maybe its causing an error of sorts. send the error please and i or gooey goo can investigate further

If your particle uses custom images, then likely you forgot to add those images to the resources file.

and how I do it
maybe in another bin file I transform it to XML for editing

but where is this file
Is it in resources.xml.bin?

yeah, sorry for not being specific. You need to add it to the resources.bin file, so you just need to decrypt it, add the resource, then reencrypt it.

ok tanks