My friend and I made a mystery game with the openai api: https://inkvestigations.com/

It is open as in open source: https://github.com/bromberry-games/Inkvestigations

You can try it out for free and even play it for free if you use your own openai key. You can check the code that we won't take your key. Also if you try it out and need more messages just let me know.
We have some premade mysteries and also a mystery creator where you can make your own.

This was a fun project to do and we learned a lot about working with gpt and building something in general. The biggest problem with gpt for us was getting it to follow the instructions correctly even after a ton of messages, which we kinda managed to solve with some chain of thought prompting and few shot prompting. Also we are using the tipping prompting technique, which was a huge highlight when it worked for us. I guess gpt really likes money.

However I have to say that the quality is not really there (yet). I think the responses often fall very flat and are kind of mediocore with occansional highlights in between. There is still a long way to go from gpt to a competent game master. Don't let that deter you from trying it out tho, it's still fun for a couple of tries. We still have a couple of ideas left to make it better by using some more langchain features like the example selector, but will then leave the project alone.

Did anyone here have success making gpt feel more "alive". You can prompt him to be a persona. For example we wanted it to play a dark and grim police officer, but always when we tried something like it, it just overplayed it's role so much that it got annyoing after ~5 messages.