moosh is not a game.
Moosh stands for MOOdle SHell and is a command line only tool for Moodle. It is not something you install via Moodle Admin interface.
Please see:
https://moosh-online.com/
and install via git from https://github.com/tmuras/moosh
From command line on your server:
git clone https://github.com/tmuras/moosh.git
or here is a link for the zip which you can acquire on your server via wget:
wget https://github.com/tmuras/moosh/archive/refs/heads/master.zip
'SoS', Ken
