Riccardo Zacconi was the co-founder and CEO of King Digital Entertainment, the video game company that had quickly established itself as the world’s leading maker of casual games for mobile devices after the sensational success of its game “Candy Crush Saga.” He’s faced with the central question of whether and how to scale the company through an astronomical period of growth. Harvard Business School professor Jeffrey Rayport discusses his case “King Digital Entertainment” — whether a single creative studio can scale to manage a portfolio of almost 200 games, when one of them is the mammoth hit Candy Crush.