Simulators are an inseparable part of the design and evaluation of distributed multi-agent protocols. In this work we put forward PViz, a novel visualisation tool built for one of the most prominent, publicly available P2P simulators, PeerSim. Our tool provides network visualisation for different overlays, interaction with the simulation through scenario re-playability and stepwise execution, and intuitive visualisation features such as panning and zooming in/out of the network, color-coding of nodes, and event alerting. Categories and Subject Descriptors I.6.8 [Computing Methodologies]: Simulation and Modeling—Visual General Terms Experientation, Measurement Keywords peer-to-peer; multi-agent; simulation visualisation; PeerSim