Oops..heh heh...I can't read. I have that tutorial and it is very good. However, I have a couple of suggestions. It is kinda slow on some of the easy concepts and super fast on some of the harder ones. Can I suggest (maybe this should go to the site...) that you make the scrubber 0% - 100% for each ...

What online tutorial??

Brilliant! So would there be a way of randomly picking which particles get this variable and change this to other particles at different times? Could this be done via states? You could add a custom parameter (self.whatever) and then assign a randomly selected Boolean (0 or 1) to that parameter. The...