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
Booster pack Booster pack In collectible card games, digital collectible card games and collectible miniature wargames, a booster pack is a sealed package of cards or figurines, designed to add to a player's collection. Booster packs contain a small number of randomly assorted items (8–15 for cards; 3–8 for figurines). Booster packs are the smaller, cheaper counterparts of starter decks, though many expansion sets are sold only as booster packs. While booster packs are cheaper than starter packs, the "price per item" is typically higher. Booster packs are generally priced to serve as good impulse purchases, with prices comparable to a comic