Concentration is a card game, apparently of the Rummy[?] family where all the cards are laid out on a surface and two cards are turned over each turn. It can be played with one player or many players. This scheme is often used in quiz shows. It is also known as Memory.
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... United States.
However, because the GBA has no region lockout, European games will work fine on a U.S. GBA unit, and apparently, even a player who knows no Japanese c ...