My idea for The *Best* (hypothetical) Computer Game Ever:
You plug yourself into your virtual reality machine. The launch screen boots up, and the AI asks you what you want to play. You describe what you want to play (such as what the OP described) and the AI spends a few moments creating it for you from scratch.
Of course, multiple people can link and play in the same universe.
The AI learns more about you as you play from reading the signals from your brain. How you act. What you like or dislike. As time goes on, it keeps creating better and better games for you.
Boom. Totally feasible by 2023, I'm sure.
