Has anyone ever played this on a real arcade? Im just wondering because I think I found a method to own this game. It is rather simple, destoy all the mushrooms at the lower level, all of them, fuck the centipede. Then simply kill the centipede by placing yourself on the right side and spamming the shoot button which kill them instantly and the corresponding mushrooms that will form. Once you kill that initial centipede chain, any new ones get destroyed rather easily when they cross your line of fire, which they will since you destroyed all the mushrooms. The spiders can't do shit to you since they spawn right where you are shooting.
I have done this successfully on my DS arcade version for hours, but I don't know if there is something wrong with my DS's coding because if there isn't, this game is too easy. I could probably get my little sister to do this method.