Mobile game maker King Digital Entertainment Plc priced its initial public offering on Tuesday at the mid-point of its expected range, valuing the Candy Crush Saga maker at about $7.1 billion despite questions about whether it can replicate the success of its smartphone smash-hit. The offering marks the largest United States IPO from a booming mobile gaming industry that has been keen to emerge from the shadow of Zynga Inc, the social gaming firm that lost half its value after a 2011 IPO that valued it just below King at $7 billion. London-based King priced its IPO at $22.50 per share, with the stock to debut on the New York Stock Exchange on Wednesday.