Cross Platform Game Maker is a GPT created by Zezhou Lin aimed at assisting users with game development across various platforms and languages. This tool is built on top of ChatGPT and it requires a subscription to ChatGPT Plus. Cross Platform Game Maker serves as a library of advices and guidelines for aspiring game developers, as well as an interactive platform for them to engage in developmental dialogues. This GPT is equipped to handle queries from the basic, such as 'How to create a game for multiple platforms?' to the more intricate ones, like designing game stories and mechanics specifically for mobile platforms. Furthermore, the tool can also provide examples of successful indie games to help new developers gather insights and inspiration. The primary aim of Cross Platform Game Maker is to provide the necessary insights and advice needed to build games suitable for different platforms, thus offering a comprehensive assistant for game development. Whether it is the conceptualisation of the game, the designing of the story, the determining of mechanics, or adaptation to different platforms, this tool extends its support throughout the game development process, making it a considerable starting point for both newbie developers and those seeking to cross-transfer their games onto different platforms.