GPT Monsters is a GPT designed to create an interactive and engaging gaming experience. Utilizing image generation technologies, this tool allows users to summon monsters by inputting words, simulating an imaginative environment where words become monsters. Beyond simple summoning, the gameplay includes monster evolution through battles and opportunities to merge multiple monsters through fusion. The ultimate goal within this environment is to defeat the last boss. Given the nature of its functionalities, GPT Monsters encourages creativity, strategic thinking, and linguistic abilities. To interact with the tool, users need to sign up for the service. The GPT also comes with some useful prompt starters such as asking for instructions on how to play the game or asking about particular commands like Fusion and Battle. Note that usage of GPT Monsters requires the ChatGPT Plus subscription. This tool, developed by , sits on top of ChatGPT and broadens its capabilities to offer enjoyable and diverse uses of AI technologies.