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From what I can tell the episodes where a player gets sugar stars serves no purpose what so ever. I have played games like monster busters where there was a world wide leader board so every star or level a player won or passed meant something and saw them rank up and move up the leader board. Since there is nothing like that in candy crush couldn't king & the game developers do something useful with them and help the players by giving them boosters for completing levels with sugar stars? An idea win five levels with sugar stars and receive a colour bomb, fish & stripped/wrapped. Win ten and receive a lollipop hammer, free switch & lucky candy. Win 15 for a ufo & 20 for a party booster or an amount of gold bars? Once a player has completed all the tasks it resets like the chocolate box.