Pair UP! game (also known as Concentration, Memory, Pelmanism, Shinkei-suijaku, Pexeso or simply Pairs, is a card 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. It is an especially good game for young children, though adults may find it challenging and stimulating as well.

At the beginning of memory game all cards are laid face down. Two cards (pair) are flipped face up over each turn. If pair of those two cards are the same then they are left open, othervise they are turned face down again.