This is an experimental game coded in JavaScript I've been working on recently. It's a cell-based game, much like AgarIO and SlitherIO, but it is unique in its own ways. The multi-player version of TrajectIO is not near completion, even though some of the client-server communication logic is coded.
A client-side-only version of this app is available at the above link. Feel free to take a gander.
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NodeJS
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NPM
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SocketIO
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ExpressJS
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Clone from Github
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Run "npm install" to install the necessary packages
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Run "npm start" to run the services
This game is experimental and not completed yet. If you want to try this game, I recommend that you only use the client version for now, which can be used by replacing the file at client/js/app.js with the code inside client_side_only.js.
Alternatively, I have exactly that set up at http://traject.io/ if you would rather take a look there.
If you try it, be sure to have the window at a reasonable size for the client-side-only version, so that the objects have room to move around at scale.