The game starts with a 9x9 board with three colored balls selected from
seven possible colors. The player may move one ball per turn, and only to a
particular space on the board if there is a path (linked set of vertical or
horizontal empty cells) between the current position of the ball and the
desired space. The goal is to remove the balls by forming lines (horizontal,
vertical or diagonal) of at least five balls of the same color. When such
line is completed, the balls in those lines disappear and he gains one turn,
i.e. he can move another ball. If not, three new balls are added, and the
game continues until the board is full.