The document presents a conceptual design for a solution called Urban Rubber aimed at increasing visitors to the Leeuwenstein shopping center and Spoorzone area of Delft. The solution would involve a competitive mobile game and physical event where families and children could race and explore the area, learning about its history and future plans. The goals are to stimulate discovery of the area, create a desire among families to visit together, and increase the number of visitors to Leeuwenstein to pre-construction levels. The conceptual solution and timeline are described along with personas, experience targets, and how the promise of more visitors will be achieved.