Candy Crush Maker Files IPO: The 7 Most Addictive Smartphone Games

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King Digital Entertainment, the creator of insanely popular game Candy Crush, announced a $1.9 billion-a-year revenue at its IPO offering Tuesday. With over 500 million downloads, it's pretty clear that millions of us are hooked on those imaginary little candies. Click on to find out which other smartphone games are most addictive.

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