I believe that game mechanics are not copyrightable. The text and artwork are, but not the rules themselves. My dad has a naval-themed clone of Milles Borne, w

I believe that game mechanics are not copyrightable. The text and artwork are, but not the rules themselves. My dad has a naval-themed clone of Milles Borne, which we played a lot when I was a kid: https://boardgamegeek.com/boardgame/6806/nautic-miles https://boardgamegeek.com/boardgame/6806/nautic-miles I liked it so much that when we had a school project to make a game, I made a space themed clone of that!