S rank unlocks after you beat the game, they are tickets to. . For Ni no Kuni: Wrath of the White Witch on the PlayStation 3, a GameFAQs message board topic titled "How do you unlock more prizes at the. To get. Here you can participate in four different games -- Slot Machine, Blackjack, Double Cross or Platoon -- to win chips and trade them in for awards. A rank unlocks later in the story, they are jumbo stardrops, moondrops, etc.