—In this demo we present a performance evaluation testbed for peer-to-peer gaming overlays. It consists of a 3D first person shooter game that is designed to run in a simulated network environment as well as on a real network. Simulation with autonomous players (bots) guarantees scalability, a controlled workload, and reproducible results; a prototype deployment on a real network can then validate the simulation results. The information dissemination overlay pSense is implemented as a first subject for evaluation.