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From Astrea Wong:
In the magical land of Unitopia lives a family of princess unicorns whose sole purpose is to collect magical candy free of evil to sprinkle that goodness onto earth. They live in an enchanted castle in the sky beyond any human eyes where rainbows are born and peace prevails. Until evil unicorns who use dark magic try to invade and take over the castle to spread evil down amongst us. Help the pretty princess unicorns defeat the evil dark magic unicorns by deciphering which candy to collect and destroying the evil unicorns with pure diamond magic!