Line up 5 balls of the same color horizontally, vertically, or diagonally.
Here's another hair-puller for you that is quite addictive. You must line up 5 balls of the same color either horizontally, vertically, or diagonally so that they will disappear, because when the board is filled with balls the game ends. Version 3.0.002 may include unspecified updates, enhancements, or bug fixes.