what do you think of a battle boats game that was just like the normal one except there would be three stars randomly placed on the bored after set up. If your opponent hits one of the stars he or she would then get to make five shots instead of one on the next turn. Or perhaps there could be two white stars that give you that option and one black star that would give it to your opponent instead. doesn't have to be stars though, it could be a plane or something else.

just an idea.