GNOME (Generating Novelty in Open-world Multi-agent Environments) is an experimental platform designed to test the effectiveness of multi-agent AI systems when faced with novel situations (novelty). It separates the development of AI game-playing agents from the simulator, allowing for unexpected novelty (novelty that is not affected by model selection bias). GNOME, which uses a web GUI, was demonstrated at NeurIPS 2020 using the Monopoly game to stimulate open discussion about AI robustness and the nature of novelty in real-world environments. In this paper, we detail the key elements of that demonstration and provide an overview of the experimental design that is currently being used by external teams developing novelty-adaptive game-playing agents under the DARPA SAIL-ON program.