Vendetta Online is a twitch-based, science fiction massively multiplayer online role-playing game (MMORPG) developed by Guild Software for the operating systems Android, Linux, Mac OS X, iOS, and Microsoft Windows. It uses the NAOS game engine, a fully real-time flight model and combat system, to offer first-person/third-person shooter-style player versus player and player versus environment battle action against the backdrop of a massively multiplayer universe. Vendetta Online shipped as a commercial MMORPG on November 1, 2004 with a subscription-based business model, although it has been running continuously since April 2002. Vendetta Online is available to play across a wide array of platforms, including the Oculus Rift virtual reality display, allowing all users to directly interact in a single, contiguous galaxy. It is also notable for its twitch combat and fidelity to real physics. Gameplay The twitch gameplay in Vendetta Online revolves around lining up a correct shot against enemy ships, while avoiding incoming fire. The dynamics of this can be complex, as ships are moving through 3-D space, and the weapons fire itself has a specific velocity, modified by the ships' absolute velocity. The ships mostly obey the laws of Newtonian Mechanics although a few artificial limits are put in place to increase the playability of the game. The control scheme includes a full six degrees of freedom, allowing users to assign keys or control axes (via joystick, thumb-stick, throttle, accelerometer, or touch area) to yaw, pitch, roll, and thrust along three axes. Ships can also be controlled with the mouse and keyboard using "mouselook" mode, in which the direction of view is controlled by the mouse and the ship's nose auto-corrects to catch up. Ships each have detailed specifications such as mass, thrust, torque, cargo capacity, top speed, turbo energy drain, armor, and weapon ports. There are also many variants of the main ship types, some holding certain advantages over others, with some advanced variants belonging to special factions. Depending on what equipment is being used, and what is carried in the cargo hold, the mass of the ship (and consequently maneuverability) will change greatly, affecting combat. Weaponry There are a wide variety of weapons in Vendetta Online, some requiring energy to fire, others relying on ammunition, proximity fuzes, target tracking, or some combination thereof. As most weapons have a cone of fire assisted by autoaim, effectively deploying weaponry relies less on careful aiming than it does on managing