This casual game has a long history in the world everywhere .It is simple but interesting .You just need to use four decimal numbers (from 1 to 13 which corresponding the card in the poker games from A to King) to get out the result 24.
More and more to practice this game, you would find you become more clever and be more familiar with the calculate numbers.Your IQ value will also increase.:-)
You can also play with your kids,your families,your friends, to find who has the top smart mind.