This highly addictive game will keep you thinking for hours. The simple object: Prevent the board from filling up completely by aligning balls of the same color into a vertical, horizontal or diagonal row. The lines disappear, increasing your score and freeing up space on the board. Longer lines give you a higher score, but shorter lines are easier to build. As you try to line up the colors, more balls will come down to block your path until there is no more room for useful moves. This great-looking game is easy to learn, but hard to master.