First released in 2012, "Candy Crush Saga" has become a colossal success for Swedish app developer King. Available across iOS, Android, Facebook, King's own website, and select other social networks, at its peak it had over 20 million daily active users -- a record held until the advent of "Pokémon Go" in mid-2016. A combination of novelty, accessibility, intricacy, and an aggressive approach to growth and revenue generation meant King's hit was thought to be making close to $1bn US dollars a year.



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