If you ask people what the toughest NES game is, you're probably going to hear "Ghosts 'n Goblins" quite a bit. Sure, you'll hear "Battletoads" and the occasional "Dragon's Lair".
And it's true, all of those games are tough, especially Ghosts 'n Goblins, which is made doubly tough in that you have to beat the game twice to see the real ending.
But...
Let's say you go to the title screen
and press the following buttons
Press and hold Right, press B, B, B. Release Right. Press Up, B, B, B, Left, B, B, B, Down, B, B, B, Start
Done correctly, instead of starting the game, you'll be presented with the level select screen
Just pick the last stage, Stage 7, and go to town fighting the last boss.
And when you win, you get the false ending.
But!
You get to level select again after you clear the stage, so choose Stage 7 again, and fight the boss again to reveal... the true ending!
Which is below this line
Is it worth all the frustration of playing the game normally? Eh, probably not.