I used to play a ‘command line game’ that was written in FORTRAN and ran on a DEC PDP 11/70. This was back in the 1980’s by the way.
It was called DUNGEON (yes, Dungeons and Dragons). You didn’t need special ‘commands’. You simply typed in , in standard English, what you wanted to do. It was amazingly accurate in ‘interpreting’ what you wanted done. It was even good at telling you when you were asking for idiotic things.
However, these games actually use commands in bash to accomplish their goals. They are games for learning and practicing the command line in Bash.