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Hello @nayem and welcome to our friendly King Community! Are you talking about Candy Crush Friends? There are special boosters that you can earn - like a fish, a circle and a rectangle candy that help you when you start a new level and they are timed - usually 30 minutes (if from a special event) or 2 hours. Then the boosters you can choose to use in a level (if you have them available) are a pink hammer, a stripe hammer and a wrap hammer.
I do not understand which booster you are referring to and how it could be 'locked'. Can you please provide more information in the comment area below?
Thank you.