An easy way to destroy that pesky security tower in secret area 3 is to use lava stage, marumasa zues hammer and copy dmg. Since there is only #1 towers you cant get dmg by them so you have to dmg yourself, wait till you get lava stage and zues hammer and dmg your self real good. (note: cannot be heat style or you cant dmg yourself with lava stage). Then when copy dmg and marumasa comes, use copy dmg on the top tower and then let marumasa rip on the bottom 2 towers. And your prize for this battle is a hole chip.