Candy Crush Saga maker King files for an IPO

King Digital Entertainment makes one of the hottest mobile games around: Candy Crush Saga. And now it may become one of the hottest stocks in gaming.

The game publisher has filed initial papers with the U.S. Securities and Exchange Commission for an IPO that would make it the biggest publicly held company in the multibillion dollar casual game industry. The London-based company (which has studios in San Francisco and around the world) plans to raise up to $500 million in its IPO, according to the filing.