Basically, although it's developed by Gumi, Bust-A-Move Islands is a King-ified version of the eponymous iconic arcade game. Specifically, it features elements that are recognized staples of King's casual mobile games, most notably level- and energy-based progression.
Bust-A-Move Islands is much like King's Bubble Witch Saga which is a rather weird thing to say, considering that Bubble Witch Saga is “inspired” by Bust-A-Move in the first place.
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Anyway, Bust-A-Move Islands has you helping the classic unwitting-dragon duo of Bub and Bob as they shoot and burst bubbles through more than 200 puzzles across a series of fantasy islands.
You can enjoy the game in single-player mode. Or you can connect to Facebook for a more social gaming experience, including the ability to play and compare scores with your friends.