Rockpaperbowsetthentaidemo.apk -

The "rockpaper" portion of the filename indicates the game uses the classic RPS mechanic, often used in adult games as a "win-to-reveal" system:

As a derivative of Nintendo's copyrighted characters, games featuring Bowsette are typically non-commercial, fan-made works often shared via APK files on indie platforms. Core Mechanic: Rock Paper Scissors (RPS) rockpaperBowsettHentaiDEMO.apk

The character became an internet sensation, leading to thousands of fan art pieces and numerous independent "doujin" game projects. The "rockpaper" portion of the filename indicates the

RPS originated in China during the Han Dynasty (206 BCE – 220 CE) and was later standardized in Japan as jan-ken . games featuring Bowsette are typically non-commercial