Concentration (game) as an educational game. Any deck of playing cards may be used, although there are also commercial sets of cards with images. The rules given here are for a standard deck of 52 cards, which are normally laid face down in four rows of 13 cards each. The two jokers may be included for a total of six rows of nine cards each. Additional packs can be used for added interest. Standard rules need not be followed: the cards can be spread out anywhere, such as all around a room. In turn, each player chooses two cards and turns them
Italian playing cards the result of popular 16th and 17th century games like Primero and Ombre. These three patterns are closely related, having been formed in close proximity to one another. The Trentine pattern is believed to be the oldest surviving Italian pattern and the origin of the Bresciane and Bergamasche patterns. Trappola cards may also have originated from this pattern. Trentine cards are sold in either packs of 40 or 52. The smaller deck is missing the 8s through 10s. The larger deck comes with a pair of Jokers. All the Kings sit on thrones and the cards are not reversible. The