The revitalisation of Siu Hei Court Sports Ground injects smiles and energy into a decrepit rooftop space, transforming an ordinary and dated sports ground into an intergenerational play space that provides a wealth of experiences for people that falls in anywhere in the spectrum of age, ability and interest. Tuen Mun is stigmatised by a myriad of reports to be one of the unhappiest districts in Hong Kong. Inspired by the name of the estate, which rhymes with Chinese characters - smile and laughter, the design aims to evoke a sense of happiness and positivity, sending joy to neighbours and users alike. User-centric and dual-function designs are introduced to the sports ground. The lower level is a multi-functional play space, with sports courts, running track, and a gridded playscape that encourages unstructured and creative play. The upper level is geared towards basketball players. Elements are added to standard court markings to add possibilities for new shooting games. Spectator seating is introduced to provide a shaded resting space and to connect the previously separated levels. A car tire installation, reminiscent of old playgrounds in Hong Kong, is designed as special seating and as targets for throwing games. Various interactive wall art and installations, some co-created with neighbourhood kindergartens and primary schools, are also available to for users with different interests. This project creates a new identity for Siu Hei and demonstrates how the untapped potential in rooftop sports ground can be unlocked to provide more meaningful and fulfilling play experiences for all.