The space invaders don't fire randomly, well, they do except all at once when they do fire.
System->every random(3) seconds, invader spawn fire object.
Also, if possible, I want them to all move down one when one hits the edge, just like in the original version. I tried the "Pick All" system event but for some reason they all cling to the edge for some reason and get messed up.
Thanks in advance for your help.