You need to complete one or more goals to beat match 3 levels. The goals are displayed before you begin each level. You can see your progress in the scoreboard on the left.
Match three or more pieces of the same type to complete goals and progress through the levels.
Usually you only have a limited number of moves for each level. Use them well.
You earn more coins the more moves you have leftover after you complete the level goals. The more moves you have left, the more coins you will earn!