The ET Game that Atari made. If I can remember correctly it was such a failure, that off the 5 million cartrides they made I think they poured over half of them into a desert. xD
E.T. was a horrible game, it wasted tons of my life playing it with my cousin. But the worst game by far, that I have played is "Bible Games". I don't even suggest you look it up because it would be wasting tons of your life. o.O