Game Designer Assistant is a GPT designed to assist in video game development. It serves as a co-designer who can help in conceptualizing and problem solving during the game design process. Leveraging the cognitive capabilities of ChatGPT, it enables users to initiate consultations on various topics about game design, including the elaboration of a Game Design Document (GDD), narrative development, and strategies for overcoming classic design challenges like the 'door problem', among others. Its purpose is to streamline the creative and technical facets of game development by offering advice and solutions that can potentially enhance the gaming experience and resolve design-related issues in an effective way. It is important to note that this tool requires a ChatGPT Plus subscription, meaning that users must have an active subscription to ChatGPT Plus to access and benefit from the Game Designer Assistant. This GPT can engage in back-and-forth exchanges with users to refine their ideas and troubleshoot their problems, not only providing insightful advice but also prompting users to approach their designs from unique perspectives.