Poker24(Train your brain) app for iPhone and iPad

Challenge yourself everyday.! The Poker24 Game is an arithmetical card game in which the object is to find a way to manipulate four cards used as integers so that the end result is 24.

HowToPlay:
1. Ace, 2-10, Jack, Queen and King represent 1 to 13 respectively.You win if you can compute 24 with the 4 cards.
2. For an example card with the numbers 4,7,8,8, a possible solution is the following: (7-8/8)*4=24.
To play this game, Mental arithmetic and fast thinking are necessary skills for competitive play. Pencil and paper will slow down a player, and are generally not allowed during play anyway.

"The 24 game has been played in Shanghai since the 1960s, using ordinary playing cards. Robert Sun commercialised the game and copyrighted it in 1988, introducing dedicated game cards bearing four numbers each".
Train mode and Challenge mode give you professional guide.