La Ruperta Fantasma ("The Ghost Ruperta") follows the rules of Battleship. There is a grid with lines and columns identified by letters and numbers. The contestants have to choose a spot from the grid. It could contain a "slip", a "sneak pumpkin" or the "Ghost Ruperta". Getting in a "slip" give the contestants a question. If they answer correctly they go on playing, if they fail you loose your turn The "sneak pumpkin" opens all the spots around the sneak. The "Ghost Ruperta" makes the contestants the winners. There is only a single Ghost Ruperta on the whole grid