Around 1992 I played a game in our school computer lab on what MIGHT have been an Apple II not sure. I know it ran the Oregon Trail for Apple II but the first DOS version of The Oregon Trail and the Apple II version have very similar graphics. It also ran Treasure Mountain.
The graphics were something like Altered Ego->
http://www.abandonia.com/en/games/263/Alter+Ego.html
The game was third person puzzle. I seem to recall you exploring a castle as a little boy or girl picking up keys and puzzle pieces in order to eventually get parts of a knight robot. The knight when complete was used to attack the boss, I THINK a dragon. I recall at the end the dragon flies away when you win. When fighting the boss, you control the knight by stepping on arrow key pictures.
Also the only thing that "hurt" you were the worms around the castle who could swallow you, requiring you to navigate your way out the worm's innards.
It was a cute game and has stuck in my mind all these years.