In this paper, I discuss the relationship between playing mobile games and well-being. My results showed that playing mobile games approximately 2 hours (1.85 hours to 2.02 hours) per day gives the most well-being, especially "connection and gratitude". In other words, moderate play of mobile games has positive effects on people’s lives and well-being. However, if a person would play mobile games for an extremely long time, the well-being became very low.