you can get that single jewel by getting arrow from four same color jewels or rainbow ball color from five jewels same color i reach now lvl 230 and have one star with 716 points good luck .hope with luck reach last lvl 320

hehe i am at lvl 102 now and earn 285 stars , i think you can beat lvl 51 if your cell have good ram and fast , just keep play try get color ball will help you to choose color ball . or try mostly get arrow will help too