I mentioned Bad Dudes the other day when I was talking about finding our friend Karnov in more games than just his own. The game was brought to the NES, but since putting quarters in your NES doesn't actually get you any continues, the game's actually pretty tough.

So, you do what I do to make it easier on yourself. Go to the title screen.

Then pick up controller 2 and (quickly) press "B, A, Down, Up, Down, Up", then Start on controller one. Done right, you'll see this:

Which probably doesn't mean a whole lot to you, so when you get into the game proper, it displays correctly

Now, with that many chances, you'd practically have to try to fail to rescue the president from the ninjas.