def helpmessage():
    """Return help message."""
    message = '246 : In the cell of row 2 column 4, put number 6\n'
    message += 'b   : take Back one move\n'
    message += 'c   : show Current position\n'
    message += 'i   : show hInt for current position\n'
    message += 'q   : Quit kaidoku\n\n'
    message += '[Select problem]\n'
    message += 'j num  : Jump to problem num\n'
    message += 'n      : Next problem\n'
    message += 'p      : Previous problem\n'
    message += 'l level: change Level\n'
    message += 'book   : show index of the book\n\n'
    message += '[Help]\n'
    message += 'h  : show this Help\n'
    message += 'ha : show Help for Advanced commands'
    return message
