Green flag. The "Nodes" variable commands the number of particles to be computed. Press the green flag again after changing its value.
<EDIT: this is an old project- and a remix please check out my newer (and better) projects> This is a remix. I added more colors and shades. I hope you enjoy! Space to change the background. Up and down arrow key help get more exact numbers. v DON'T GO DOWN THERE v Try turbo mode!