I just felt in a hole!
i got a mr gimmich game for the nes and it has some glitch in it toware the bottom of the screen is scrambled......
there should be a 3rd poll option for "get a PAL NES and a 50hz compatible TV"
The best way to fix it is to freeze the cart overnight then plunge it into a bowl of boiling water (make sure you spread some mustard on the contacts beforehand).If that doesn't work, then slowly simmer it for 20 minutes in beef stock.