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Screeps is an open source game for programmers, whose main mechanism is programming. You can control your colonies by writing JavaScript. It's an extremely sustainable world of 70,000 connected gaming rooms, with 40 server clusters (160 processor cores) using Node.js to manage the player's scripts, like a programmable world, even offline. You can live 24/7 in real time and you can also use libraries from real projects. In addition to these, you can also compile other languages using JavaScript or via Web Assembly. Screeps is a fun game with a unique angle. Using actual programming instead of pseudo-language actually allows players to focus on better coding habits and make exercises fun.