def makeGameBoard(n):
    """ 
    Create a gameboard represented as a dictionary. 

    Game board consistis of numeric placeholders starting 
    with zero and going to the last number stipulated
    -------------------------
    | 0| 1| 2| 3| 4| 5| 6| 7|
    -------------------------
    | 8| 9|10|11|12|13|14|15|
    -------------------------
    |16|17|18|19|20|21|22|23|
    -------------------------
    |24|25|26|27|28|29|30|31|
    -------------------------
    |32|33|34|35|36|37|38|39|
    -------------------------
    |40|41|42|43|44|45|46|47|
    -------------------------
    |48|49|50|51|52|53|54|55|
    -------------------------
    |56|57|58|59|60|61|62|63|
    -------------------------

    Parameters: 
    n (int): number of last gameboard cell 

    Returns: 
    dict(): Dictionary with key values representing game 
    board cells, values representing visited or not

    """
    gameBoard = {}
    for i in range(0, n + 1):
        gameBoard[i] = None
    return gameBoard