Move your marbles up and down, or rotate center row, in order to match at least three marbles of the same color in the center row. However, you can only move up or down if there is empty space above or below! Match 5 marbles of the same color in order to remove the entire center row!
For every match you get points. The more marbles of the same color are matching, the more points you get. Every few seconds new marbles are added. You have to avoid the field becoming crowded, because it will make it very hard to move your marbles!