We present OpenRelativity, an open-source toolkit to simulate effects of special relativity within
the popular Unity game engine. Intended for game developers, educators, and anyone interested in
physics, OpenRelativity can help people create, test, and share experiments to explore the effects
of special relativity. We describe the underlying physics and some of the implementation details of this toolset with the hope that engaging games and interactive relativistic “laboratory” experiments might be implemented.