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Shares of Zynga Inc. (Nasdaq: ZNGA) plunged nearly 13% in pre-market hours after the "Farmville" game-maker reported a surprise first-quarter decline and lower-than-expected sales. Meanwhile, shares of competitor King Digital Entertainment Plc. (NYSE: KING) surged more than 23% after the company beat earnings estimates. Its newer games like "Candy Crush Soda Saga" helped boost profits and make up for the declining popularity of older games.