Abstract: A slot machine. In one embodiment, a given symbol is included in each of a series of symbols, and a judgment device is provided for locating the positions of a plurality of given symbols appearing within the windows but not all on the prize-winning line, after all the symbol series have stopped. Provision is also made for outputting a prize-winning signal when the plurality of given symbols form a predetermined arrangement. Symbol series stop position adjustment is also made, responsive to the prize-winning signal, for automatically causing at least one of the plurality of symbol series to move for the adjustment of stop position so as to attain a prize-winning symbol combination of the given symbols on the prize-winning line. In another embodiment, a specific symbol is included in one of the series of symbols; and the judgment device outputs a prize-winning signal when that specific symbol is positioned on the prize-winning line after all the symbol series have stopped.