Supercell, the Finnish tech start-up behind the Clash of Clans and Hay Day franchises, raised $1.5 billion last year from the Japanese telecommunications company Softbank, in a deal that valued Supercell at around $3 billion. Other European gaming companies include Wooga, a Berlinbased start-up that has created a series of social gaming hits like Jelly Splash that continue to top the charts on both Appleâ€™s iTunes and Google Playâ€™s stores. The rise of the nearly 11-year-old King, built largely on the huge success of Candy Crush, has had many analysts and prospective investors eagerly await an I.P.O. The company said that its profit surged more than 7,000 percent last year, to $567.6 million from $7.8 million. Revenues climbed tenfold, to nearly $1.9 billion.