Concentration, (also known as Match Match, Match Up, Memory, Pelmani, Shinkei-suijaku, Pexeso or simply Pairs), is a great classic memory game that can exercise your mind. All ages will find it challenging and stimulating. Concentration is a game in which all of the tiles are laid face down and two tiles are flipped face up over each turn. The object of the game is to turn over pairs of matching tiles to clear the board. You only have a limited number of moves available, so you need to focus.