YPilot is a multiplayer 2D space game. It can be played in a web browser that supports modern JavaScript, SVG, and WebRTC. It is tested on Firefox and Chrome, and may also work on Safari and Edge. Play YPilot.
YPilot is a spiritual successor to XPilot, which in turn borrows from classic games such as Gravitar, Thrust, Asteroids, and ultimately Spacewar!, the first known video game to be played at multiple computer installations.
YPilot is designed to be flexible and extensible, with a small core of functionality written in JavaScript, and most of the game rules written in a simple, English-like language, documented in README-yp.md. Players can choose from a number of included game modes/maps, or create their own.