I wanted to find a small game that can practice memory. I tried a lot of games, and almost all of them needed to connect to the Internet, display advertisements, and apply for permissions involving personal privacy. So I designed and produced this little game using his son's hand-made works and beginner piano songs and other materials. It is an ad-free, stand-alone version of the green game. It does not require Internet access and does not require any mobile phone permissions. Rules of the game: