It's fair to say you've probably never seen anything quite like this before. You take on the role of Richard III. Yes, the one from Shakespeare's historical play about his Machiavellian rise to power. And must work your way through assassinating various Kings and Queens: Henry VI, Lady Anne, and so on.
The game plays out like some kind of twisted mix of Pacman and Zelda, with suitably bloody interludes! The game text is in French, but even if you don't read French it doesn't stop it being a highly enjoyable and somewhat nuts game.