Someone used GPT-4 to make an Isekai RPG with an AI game master

Image Credit: Clint Bustrillos on Unsplash

A user of OpenAI’s large-scale AI language model GPT-4 has utilized it as a game engine in order to create a chat-based Isekai RPG. The game has drawn attention for the way that the AI essentially acts as the game master via the chat.

GPT-4 is the next generation large-scale AI language model announced by OpenAI on March 14. When compared to the previous versions, the new model boasts a dramatic improvement in reasoning capabilities and the brevity of its answers.

Japanese designer Takayuki Fukatsu used GPT-4 to create an Isekai RPG called Chat Reincarnation: The Case of My Childhood Girl Friend Who Was Supposed to be Dead Becoming a Hero in Another World.

Chat Reincarnation is a game where the player’s childhood friend has been reincarnated as a hero in a world of swords and sorcery. The player, who is still in the real world, uses the chat to provide advice to their friend in order to help her defeat the demon lord. GPT-4 acts as an AI game master and guides the player based on the world’s setting. The game could be described as a single-player tabletop RPG that can be enjoyed even without a real-life game master.

As the game uses GPT-4 via ChatGPT, anyone who wishes to play it must subscribe to ChatGPT Plus, the paid version of ChatGPT. ChatGPT Plus users need only to input the prompts included on Fukatsu’s blog post in order to start playing. The prompts are written almost as if they were instructions that would be explained to a human. At the end, the prompts also note that “All Input and output should be in Japanese.”

It is also possible to skip over the chat and directly participate in the Isekai adventure.

Players have complete control over how they wish to play Chat Reincarnation. Although the game prompts state that the heroine seeks modern technical knowledge from the player, it’s likely possible to expand a variety of rules, such as combining different magic and modern technology together. The game is also notable for the way the real-time chat with the characters increases the level of immersion, and there are already many posts on Twitter from players who have played and finished it.

Fukatsu is making use of the GPT series to make games one after another, and this month he also released Tokimeki of the Dead: Love Apocalypse, a romance survival game where you must live through a zombie apocalypse, and a Cthulhu Mythos survival game.

Tweet Translation:
Recently, I tried making a game using Chat GPT4.
By updating the prompts, you can make a variety of different games.
Prompts for AI game Tokimeki of the Dead: Love Apocalypse (demo)

Another user attempted to use GPT-4 to play Pokémon Emerald as a text-based adventure game. In the tweet thread below, you can see the player pick their starter, as well as game system elements, like type, level, and moves, all presented through text.

The possibility of using GPT series in a variety of different areas of game development has also been demonstrated in the previous models GPT-2, GPT-3, and GPT-3.5, as you can see in the below examples.

OpenAI has already begun providing GPT-4 API access to a number of developers during the gradual rollout of the model. Development of a range of services using GPT-4 is being carried out with fiery enthusiasm, and we may also see the technology have a major impact on the game industry in future.

Written by. Marco Farinaccia based on the original Japanese article (original article’s publication date: 2023-03-16 22:52 JST)