https://blog.faceutil.com/2017/03/23/gb-%eb%b2%84%eb%b8%94-%eb%b3%b4%eb%b8%94-bubble-bobble-%eb%b3%b4%ea%b8%80-%eb%b3%b4%ea%b8%80-%e3%83%90%e3%83%96%e3%83%ab%e3%83%9c%e3%83%96%e3%83%ab-%cf%81/