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Hi @miemie09 and welcome to our Community! 🤗
Can't you unlock the level in the sense that you can't get past it or just can't get into the level?
NOTE: If you are referring to the boosters at the beginning of the level, they cannot be selected. When a new feature is introduced (in this case the frog) or the board is full of blockers at the beginning of a level, the blank booster screen will appear.