It was basically a box of riddles.
From what I remember, you picked a card and had to solve the riddle. If you answered correctly, you could move ahead one space... or fill-in a square. Once you had moved so many spaces (or filled in so many squares), before your opponent, you'd won. But there wasn't that many spaces and riddles were tough!
A very taxing game. I remember my Dad buying it for me for me one Christmas and it took us ages to complete a game as the riddles often stumped both of us. I believe I still have it tucked away.