What earns the bronze, silver and gold crowns in Bubble Witch Saga 3?

If u go back and play the same level and don't get the same amount of stars your total changes.

To earn the Chapter Crowns on Bubble Witch Saga 3, you must beat a minimum number of levels in each chapter the first time you play the level, as follows:

Bronze 4

Silver 10

Gold 16

When you beat a level the first time you play it, the game will change the color of the level’s marker on the map to gold.