You have to complete an assigned task to pass a level. You can view the conditions you need to meet to complete a level in the top right corner of the screen. To complete tasks, arrange three or more gems of the same color in a row. As you advance through levels, you will come across different types of blockers, which make completing tasks more challenging, as well as bonuses, which help you reach your goals. You usually only have a limited number of moves you can make to complete a level. Use your moves wisely.