def check_not_finished_board(board: list):
    """
    Check if skyscraper board is not finished, i.e., '?' present on the game board.

    Return True if finished, False otherwise.

    >>> check_not_finished_board(['***21**', '4?????*', '4?????*', '*?????5',\
'*?????*', '*?????*', '*2*1***'])
    False
    >>> check_not_finished_board(['***21**', '412453*', '423145*', '*543215',\
'*35214*', '*41532*', '*2*1***'])
    True
    >>> check_not_finished_board(['***21**', '412453*', '423145*', '*5?3215',\
'*35214*', '*41532*', '*2*1***'])
    False
    """
    for line in board:
        if '?' in line:
            return False

    return True