dee and I played an ancient video game where you simulate Gia Earth or some shit, and we accidentally created a desert world where all the oceans boiled off that was just fuuull of nanotech age cities of sentient fish which honestly? fucing rules
This sounds like SimEarth? I remember playing it waaaaay back when I was a kid, it was super cool how stuff like that could happen, also very interesting trying to fix it if things went wrong in ways I didn't like.