CoolLines is played on a 9x9 squared board which is filled with colored balls. Your goal is to align four or more balls (depend on level) into horizontal, vertical or diagonal lines. The line of balls will disappear and your score will increase.
Forming a line of balls of the same color you can add to it one or more multicolored balls.
To move the ball you need to tap on it. The ball will jump. Then, tap the empty cell where you want to place the ball. You can move one ball per turn to a particular place if there is a path between the current position of the ball and the desired destination.
Black balls are bombs. To activate the bomb, tap the black ball and then tap an empty cell where the bomb will explode. A few cells around the bombs will be cleaned. Your score will decrease.
The game continues until the board isn't full.