A player character is placed so as to be linked to a given edge position of a board. A plurality of puzzle pieces including an enemy character piece that represents an enemy character are placed on the board. The player inputs a selection path from the puzzle piece situated at the given edge position or the player character without removing the finger from the board so as to select and delete puzzle pieces among the plurality of puzzle pieces that are placed on the board and belong to an identical type, or are considered to belong to an identical type. When the enemy character piece lies in the selection path, the player character that corresponds to the puzzle piece set to be the start point, or the player character set to be the start point, attacks the enemy character represented by the enemy character piece.