i was hacking a few roms just a few minuits ago and ran across an awsome glitch in defender.
you have a big horizonal bar over youre ship, and when you fire it sends a big shockwave. too easy? nope, if someone shoots youre bar over youre ship you will loose a life. to doge shots repeatedly hit fire and it will go right past you. it is verry chalenging but verry cool acidental find
i will also post my astroind hack in a few minuits. youre ship is the atari logo and the astroids look more realistic.
Defender.bin