I remember from my c64 days a game I and my brother enjoyed. it was a very simple game I recall. each played a unicorn (pegasus) that well had wings and you could fly in a typical bubble-boble/mario bros kind of platform world, and the goal was to hit the other I seem to recall.
But I can't seem to find it. It might have been a non-commercial game. I got it from a friend, and I only remember it as "pegasus". but if thats a part of the name, or just the name of the beast in it I can't really recall. But I doubt there were many games on the c64 with that gameplay.