When you complete the level, is activated and will score you additional points.
For this level try to play from middle part of the board and make special candy.
Failed totally and see no chance without boosters, but also never had more than one cherry down with boosters - as moves are too few.
Candy Crush at the end has been cycling for about 30 minutes, I'll probably skip if it doesn't end around 200 million it's currently at 140+ million with no end in sight, thanks to the design of the board encourages perpetual cascading matches.
Hence, an additional 42,000 points is required to earn one star.
Perhaps I'll stay awhile more!! Kindly please stop spamming every single level.