These stars are experience points. When the circle completes as you collect more stars - you level up and get 5 free diamonds. Currently, the maximum level is 400, that means you can get 2000 diamonds completely free!
These stars are experience points. When the circle completes as you collect more stars - you level up and get 5 free diamonds. Currently, the maximum level is 400, that means you can get 2000 diamonds completely free!