A flexible card which allows data of the card to be changed with a simple operation is provided, thereby permitting users to sustain interest in the card and a relevant game. The card comprises a first dot pattern in which a coordinate value or a code value is patterned and which is recognizable by predetermined irradiation light at least on one surface thereof and a second dot pattern which is patterned in a predetermined algorithm in a region overlapping with a region where the first dot pattern is provided or a region different from a region where the first dot pattern is provided.