Lines

Move the balls on the board to compose continuous vertical or horizontal lines of 5 or more balls of the same color in order to explode them and increase the score.
The balls can move in vertical or horizontal directions on vacant cells.
If after the move, no balls are exploded, 3 new randomly generated balls appear.
With every 200 points, you get a bonus ball that can be used to blow up one ball on the board. A single-colored bonus ball allows to eliminate the ball of only that color, while a multicolored bonus ball allows to eliminate any ball on the board.
To play, touch the ball you want to displace (it starts jumping) and touch the destination empty cell (it starts moving along the path).