Play against another person or the computer. Choose between
boards with 30, 49, or 100 tiles. Find the factors and multiples that
two or more numbers have in common. Take turns picking
numbers from the grid that have factors. The number that you
choose is added to your score and its factors to your opponent's.
Winning strategies involve distinguishing between numbers with
many factors and numbers with few factors. The game is over when there are no more legal moves and
the winner is the one with the highest score.