A shuffling system of the present invention includes multiple shuffling devices which are connected in series to one another, and multiple CPUs which are independent from one another, and are connected with the respective multiple shuffling devices, in which each of the multiple CPUs is used to shuffle the cards across the multiple shuffling devices, so that the cards are arranged randomly, and further, even if the information about the shuffle in each shuffling device is stolen due to an unauthorized access to the multiple CPUs, or the like, it becomes difficult to identify shuffled cards to which the stolen information is allocated in all the shuffling devices, and therefore the possibility that the arrangement of the shuffled cards is recognized is reduced.

The present disclosure relates to a playing card, where a suit and a rank are printed on one surface of a card base sheet, a back pattern is printed on a back surface, an intermediate layer having a black layer or a color layer similar to black is provided on the card base sheet to make transmission of visible rays difficult, and ink containing no carbon is used for printing the suit and the rank. The intermediate layer is configured to prevent transmission of visible rays from the back surface. The suit and the rank printed with the ink containing no carbon are configured to transmit infrared rays. The intermediate layer and the suit and rank printed with the ink containing no carbon are configured such that it is difficult for both the visible rays and the infrared rays to distinguish the suit and the rank from the back surface.

The present invention provides shuffled playing cards which eliminate the need for a game host to shuffle cards before games by taking a lot of time as well as eliminate the possibility of cheating. A shuffled playing cards (1) obtained by shuffling a predetermined number of decks of playing cards (12) using a shuffling machine is packaged as an individual pack. The shuffled playing cards (1) is individually packaged and sealed with an adhesive label (13). A bar code (13a) which represents a unique shuffled card ID has been printed on the adhesive label (13). The shuffled card ID is registered in a database by being associated with information which allows identification of a shuffling machine used to shuffle the playing card set.

The present invention provides shuffled playing cards which eliminate the need for a game host to shuffle cards before games by taking a lot of time as well as eliminate the possibility of cheating. A shuffled playing cards (1) obtained by shuffling a predetermined number of decks of playing cards (12) using a shuffling machine is packaged as an individual pack. The shuffled playing cards (1) is individually packaged and sealed with an adhesive label (13). A bar code (13a) which represents a unique shuffled card ID has been printed on the adhesive label (13). The shuffled card ID is registered in a database by being associated with information which allows identification of a shuffling machine used to shuffle the playing card set.

A shuffling system of the present invention includes multiple shuffling devices which are connected in series to one another, and multiple CPUs which are independent from one another, and are connected with the respective multiple shuffling devices, in which each of the multiple CPUs is used to shuffle the cards across the multiple shuffling devices, so that the cards are arranged randomly, and further, even if the information about the shuffle in each shuffling device is stolen due to an unauthorized access to the multiple CPUs, or the like, it becomes difficult to identify shuffled cards to which the stolen information is allocated in all the shuffling devices, and therefore the possibility that the arrangement of the shuffled cards is recognized is reduced.

A device for production of sets of playing cards is provided, and includes: a printing means for printing randomly ordered playing cards; an identification means to identify one or more defective playing cards, having a feedback unit to instruct the printing means to reprint the defective playing cards; and an evacuation means to evacuate the one or more defective playing cards.

There is provided a shuffled playing card, wherein a suit and a rank are printed on one surface of a card base sheet, and a back pattern is printed on another surface, different sheet IDs for one card base sheet or each of a plurality of card base sheets are printed on the card base sheet, one deck or a plurality of decks are formed by individual cards cut by a cutting machine from the card base sheet, the one deck or the plurality of decks are shuffled by a shuffle machine to form a set of shuffled playing cards, different shuffled playing card IDs for each set are assigned to the shuffled playing card as ID codes, and the sheet ID of the playing card constituting the shuffled playing card and the shuffled playing card ID are associated with each other in a database.

Provided is a trading card in which a trading card package and content of the trading card package are linked and the content can be specified, and an illegal act can be found. A manufacturing method for a trading card package includes a step of grouping trading cards on which rareness degree information is printed and a step of packaging the grouped trading cards. Trading card IDs are imparted to the trading cards. In the grouping step, the trading card IDs are registered in a database. A package ID is imparted to a package. The package ID is enclosed in the package or provided on the package. The package ID of the package including the trading cards, the trading card IDs, and the rareness degrees included in the package are associated.

Provided is a trading card in which a trading card package and content of the trading card package are linked and the content can be specified, and an illegal act can be found. A manufacturing method for a trading card package includes a step of grouping trading cards on which rareness degree information is printed and a step of packaging the grouped trading cards. Trading card IDs are imparted to the trading cards. In the grouping step, the trading card IDs are registered in a database. A package ID is imparted to a package. The package ID is enclosed in the package or provided on the package. The package ID of the package including the trading cards, the trading card IDs, and the rareness degrees included in the package are associated.

A set of playing cards comprises N playing cards, N>1, each playing card having a detectable card identity string. This card identity string is a series of M characters. The set of playing cards is provided with a set identity string, this set identity string being composed of N groups of R characters, R<=M. Each card identity string provides to the set identity string one group of R characters taken from the series of M characters of this card identity string. The sequence of said N groups of R characters in the set identity string is identical to the sequence of the N cards in the set of playing cards.