Hello Kitty no Happy House is a Gameboy Color game. One day Kitty, the main character, hears a voice calling for help. Kitty goes to the house that heard the voice. In this house she senses someone living but no one answers Kitty's question. Suddenly she hears the voice in the next room, the owner of the voice was the magic mirror called "Happy-House". The goal of the game is to have joy points.