Memory is a game mechanism in which players need to remember certain information to gain an advantage. This can involve remembering the placement of game components or the contents of a player's hand or deck. For example, in the game Concentration, players must remember the location of face-down cards and flip them over to create pairs. In Hanabi, players must remember the cards in their hand that are facing outward so that they can be played in the correct order. A good memory can be an advantage in games that involve bluffing or predicting opponents' moves.