"C-Marbles" app kill time series, edited by Card "Speed".The distributed cards are taken out one after another and You will lose all my own cards earlier than a partner. The card game for which quick judgment and Speed are needed. A partner can be chosen from three kinds of strength, "EASY", "NORMAL", and "HARD." A high score can be got as a high-level partner. I will register a score and will compete with friends.