There are two possible claimants for the first FPS, "Maze War" and "Spasim". "Maze War" was developed in 1973 and involved a single player making his way through a maze of corridors rendered using a fixed perspective. Multiplayer capabilities, where players attempted to shoot each other, were added later and were networked in 1974. "Spasim" was originally developed in 1974 and involved players moving through a wire-frame 3D universe. "Spasim" could be played by up to 32 players on the PLATO network.