Puzzle games based on numbers also have their versions starred by kings, queens, princes and princesses. This one is called Mary X and you'll have to solve all these puzzles to make sure you continue on the throne.
Don't let anyone remove your throne
That's the basic plot of this game, make sure nobody moves your throne as it has already taken you plenty of effort to live at the expense of your vassals. The thing is that you have a series of puzzles in which you have to combine numbers to solve them and fix all your problems.
Sorry if you've got a dirty mind, buy Mary X has nothing to do with what you're thinking about.
The gameplay is easy to understand, but not so easy to master. Dare to solve these puzzles and challenge your friends to beat you. It'll be great fun even for the most antimonarchical gamers.