"C-Marbles" app kill time series, edited by Card "Memory".It is familiar "Concentration" in a card game. You will turn over the cards of the same number. The game of reliance of only one’s memory. A partner can be chosen from three kinds of strength, "EASY", "NORMAL", and "HARD." The play number can be chosen from two persons to five persons. If "HARD" can be won, it can be said that the "Concentration" was mastered. Cards are turned over in order, and two cards of the same number are taken and it goes. When all cards are lost, the person who took cards in large numbers most is a victory.