Mickey Mousecapade is a pretty short and relatively easy game, punctuated by unusually tough boss fights. The final one in particular is maddeningly tough.
Unless you know how to beat her with hardly any effort, which I do.
Okay, first, make your way to the last room of the last level (make sure you have the key first, otherwise that door won't open)
Next, shoot approximately the area that I've circled
There's a hidden thing there, it could be an enemy that steals Minnie away, but there's an equally good chance that it's an invincibility fairy.
Once you get it, just hold Right. Your fairy will start to leave as soon as you get into the boss room.
But as long as she's still on the screen, you're still invulnerable, so walk right into the boss before your fairy makes it off the screen.
And you win! Without shooting anything or taking any damage.
Pretty snazzy.