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d13 is a free browser game engine that allows you to build your own multiplayer online strategy game. suited for tick based empire building games that follow the 4X concept: eXplore, eXpand, eXploit and eXterminate. Despite its oldschool look and feel, d13 comes as a fully OOP, MVC web-application that features a responsive design as well as great flexibility. You can easily add troops, buildings and technologies and create templates and skins for the project as well.
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