I am wondering if I screwed up the radar simulation badly. After the first few simulations, I realized that maybe I should be pressing 0 after I have removed all potential collisions from the screen, and not only when the scenario has no potential collisions to begin with. So I began doing that.
Was this correct, or have I invalidated all of my otherwise-correct responses? Perhaps it won't even be taken into account, because they are just looking for how many collisions I prevented and how many balls I removed unnecessarily? I really hope I didn't destroy my score on the section...