Schemaverse!

"The Schemaverse is a space-based strategy game implemented entirely within a PostgreSQL database. Compete against other players using raw SQL commands to command your fleet. Or, if your PL/pgSQL-foo is strong, wield it to write AI and have your fleet command itself!"

How fantastic is that? I'm still learning so I don't know if it's good as a game, but definitely a neat and educational idea. But it's reminding me of those old school, text-based BBS games I'd play in my teenage years...only controlled by postgres! 

https://schemaverse.com/