Slide a ball into an empty cell. Line up 5 or more, or shape the balls into an arrow, and they pop. Every 50 points earns a joker: place it on any cell, even on top of another ball, and it stands in for any color in a line or an arrow. Every 75 points earns a golden joker: place it on any cell and it wipes the whole row and column through it. Four new balls drop after every move.