https://blog.faceutil.com/2017/05/19/gb-%ed%85%8c%ed%81%ac%eb%aa%a8-%eb%b3%bc-gb-tecmo-bowl-%e3%83%86%e3%82%af%e3%83%a2%e3%83%9c%e3%82%a6%e3%83%abgb-%e3%8e%8e/