good evening my Viet friend. to answer your question. all fish games game settings can be adjusted by pressing the operator switch which will allow you to access the game configuration settings . from there you can set your difficulty levels ranging from 1 being the easiest up to 25 hardest. each version and software manufacturer varies in levels, but regardless if you set it on the easiest the machine will generate money period. The original IGS software holds about up to 10 percent and the Chinese copy versions holds up to 25 percent which is better in revenue but players can tell the difference between the 2 softwares nowadays original or copy versions.