The Kigdom has embraced metaverse technologies like city scale digital twins. A digital twin is a virtual representation that serves as the real-time digital counterpart of a physical object or process. City scale digital twins are a key component of future predictive, smart and sustainable cities. The Kingdom has launched an ambitious Quality of Life Program as part of Vision 2030. The program aims to improve the individual and families' quality of life by creating the necessary environment to develop and support new livable and lifestyle options in Saudi Arabia. These options will bolster the participation of citizens, residents and visitors in cultural, entertainment, sports, tourism and other related activities that nurture their quality of life. Such options will have their own economic and social impact by creating jobs, diversifying economic activity, and consequently boosting Saudi cities' ranking amongst the world's top livable cities. KAUST's Cities:OS digital twin platform embraces this challenge with a city scale behavioral twin-of-twins model with fully tunable metrics and physics, driven by statistical data and IoT information streams. The KAUST Digital Twin aims to showcase this capability by capitalizing on KAUST's living lab approach.