PoLLjak is a home game that has modernized a traditional Korean elastic string play, ‘Gomujul-nori’. Unlike the traditional way that several people play together outside, it is designed to be played by oneself. PoLLjak is composed of supports, string, and mat. First, connect the string to the supports and the gamer plays looking at the smart phone or TV screen. And the built-in sensor in the mat detects if the gamer is playing right. The supports and mat can be stored separately.