In Arcadian, I mentioned a time my step brother cleared the Centipede screen of mushrooms. Some people doubted this, saying it was impossible. Well, thanks to MAME and a gamepad, I proved that it is not impossible. As you can see here, I did indeed clear the first stage screen of mushrooms. Again, I used MAME (but not save states) and a gamepad, which would be really different from a trackball, and I stayed on the first stage, being careful not to fully kill the initial centipede and thus bringing mushroom-producing fleas into the game. I also killed myself a couple of times, which cleared the bottom of centipede segments. But I did it. So it is possible in theory and I’m certain my step brother did it in reality.