The paper presents Cat Royale, an artist-led project that explores the design of a multispecies world where a robot arm interacts with three cats for six hours a day over twelve days. The project involved designing a custom enclosure, a robot, and various components to create an environment where the robot could engage the cats in play. The design process included considering the cats' needs, the robot's autonomy, and the role of humans in monitoring and ensuring the cats' well-being. The project highlights the importance of designing the 'world' in which technology operates, not just the technology itself. It also emphasizes the need for human involvement in areas such as animal welfare and audience engagement. The project's success was judged based on the cats' well-being and the enjoyment of the audience. The paper discusses the design implications for future multispecies systems, emphasizing the need to consider interspecies interactions and the complexities of robot encounters with animals. The project also highlights the importance of designing a 'robot world' that allows for flexible interactions with passive objects and provides safe spaces for all parties. The paper concludes with a reflection on the broader implications for designing robot worlds and digital ecologies.The paper presents Cat Royale, an artist-led project that explores the design of a multispecies world where a robot arm interacts with three cats for six hours a day over twelve days. The project involved designing a custom enclosure, a robot, and various components to create an environment where the robot could engage the cats in play. The design process included considering the cats' needs, the robot's autonomy, and the role of humans in monitoring and ensuring the cats' well-being. The project highlights the importance of designing the 'world' in which technology operates, not just the technology itself. It also emphasizes the need for human involvement in areas such as animal welfare and audience engagement. The project's success was judged based on the cats' well-being and the enjoyment of the audience. The paper discusses the design implications for future multispecies systems, emphasizing the need to consider interspecies interactions and the complexities of robot encounters with animals. The project also highlights the importance of designing a 'robot world' that allows for flexible interactions with passive objects and provides safe spaces for all parties. The paper concludes with a reflection on the broader implications for designing robot worlds and digital ecologies.