Replying...
Intro. DOES NOT WORK WITH GPT3.5, and often immediately breaks with 4. With 3.5, it ignores pretty much all the instructions. It's my first proper go at something like this, though, and when it works it's fun! This is a D&D-style game, but unlike most on here, you play the part of the DM, directing ChatGPT's player around a world you'll both have a hand in shaping. After selecting your language, GPT will roll a character and give it a brief backstory—then it's up to you to start the adventure. Describe the environment in natural language, and GPT will respond, making choices according to the input you give. It's more of a narrative generator than a fully-fledged game right now—I'm not quite sure how to design combat rounds from this perspective in a way GPT fully understands, and sometimes GPT will just make stuff up—but I've spent a couple of hours playing with it, and it can be a challenge keeping up!

You Are The DM

@Da5e