I recently tried the simh emulator,
The disk image I used can be found on the internet, and instructions for booting it are here.
Presumably it belonged to Dennis Ritchie, as the username is "dmr".
In the /usr/games folder are about 20 games and amusements for wasting expensive computing resources.
One game is called 'moo'.
I have not been able to find info about this game, but starting it prints:
Every input I have tried results in the game printing 'bad guess.'
Does anyone have experience with this game?
Ritchie is dead, so there's no way to ask him directly.