Overview
Concentration is a round game in which all of the cards are laid face down on a surface and two cards are flipped face up over each turn. The object of the game is to turn over pairs of matching cards.
Concentration can be played with any number of players or as a solitaire or patience game. It is a particularly good game for young children, though adults may find it challenging and stimulating as well. The scheme is often used in quiz shows (in fact, several game shows have used its name in their titles) and can be employed as an educational game.
Names
Concentration is also known by a variety of other names including also known as Memory, Matching Pairs, Match Match, Match Up, Pelmanism, Pexeso or simply Pairs.
Rules
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.
From Wikipedia (CC BY-SA 4.0).