A game apparatus displays a game screen of 9×9 grid, for example, of a Sudoku puzzle on one LCD and an empty cell (cell to be answered) is large-displayed on the other LCD. A touch panel is provided on the LCD to allow a player to handwrite a numeral to fill in the cell with a stick, etc. on the touch panel. When a handwritten region is larger at a certain degree or more with respect to the cell, it is considered that an answer numeral is input, and the answer numeral is large-displayed. If the handwritten region is not so large as to the cell, it is considered that a note numeral is input, and the note numeral is displayed in a smaller region in the cell. However, if the notes numeral is settled as an answer numeral, a game determination is performed according to the answer numeral.