This set includes double-sided, 4" by 4" cards that come in three levels of difficulty.  The object of the game is to make 24 using all four numbers displayed on the card, using each only once.  Players can add, subtract, multiply and divide.  There is at least one solution to every card.
— In a November 2013 survey, Dean Smith, owner of JaZams in Princeton, N.J., told TDmonthly that the 24 game is a best-selling educational toy in the store.