Irish game development and publishing company King, best known for creating freemium smash hit “Candy Crush Saga,” filed for an IPO Tuesday. The company, which hopes to raise $500 million, pulled in $1.9 billion in 2013 and says 78 percent of its total gross bookings last year came from Candy Crush Saga, which launched on mobile in November 2012. King’s revenues in 2012 were just $164 million. King says 70 percent of its gross bookings — which it defines as the total amount its users pay for virtual items and access to skill tournaments — are on mobile, and just 4 percent of users (roughly 12 million) regularly make in-game purchases.

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