In line with the client’s original intention to create an immersive children’s park, the designer combined the client’s ideas and restored the underwater world into the design of the indoor soft playground. Therefore, the indoor playground incorporates a large number of marine elements to give children an immersive amusement scene. Among them, marine creatures are designed in cartoon form and integrated into the playground, and their expressions are also designed in cartoon form, so that marine creatures can accompany children to play and explore in the park.