There was good progress in training neural networks to play video games.
Unfortunately it doesn't seem to fit in some people's context because it was a few years ago.
Kind reminder: there is "AI" beyond LLMs.
Several years ago I built a simple snake game and wrote a DQN from scratch to learn how to play it.
I was really proud of it at the time because I had to do a decent amount of reading and research since I wrote all of the NN code from scratch and wanted to add some more advanced algorithm optimisations which I hadn't done in previous projects.
I suspect a coding agent could spit the entire project out in 20 minutes now, but it was very cool at the time to build a game then watch my computer learn how to play it in real time.
OpenAI's Dota 2 adventures were super hype back in the days.