A smartphone is probably unsuitable for the small screen. On the Fire HDX 7 with Fire OS 4.5.3 it runs absolutely smoothly and looks brilliant. There are relaxing music and Cat maunzen (suppressible). Several game modes are possible, but the menu in English is held. The app complies with the styles of the game Cubistry the same manufacturer, which the symbolism is easily recognizable as the different cats - for children may be a little difficult (perhaps my granddaughter once tried it). As far as I could see after 1 game, apparently free of advertising and in-app purchases and requires no rights - very good!