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OpenGameBuilder Turns a One-Sentence Description into a Playable Game with Local LLMs

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OpenGameBuilder is an open-source tool that lets users create small games from a short description, using a local model such as Gemma 4. It builds on a world engine that draws everything in code, so a world file of only about 551 bytes of JSON can produce a full village. Users pick a world and a game type, press Play, and download the result as a single offline HTML file. The project aims to help teachers, game masters, and small game makers who cannot draw or animate. Its developers also describe a royalty model in which the tools are free and fees apply only to games that earn over US$500.

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