This looks neat. Once upon a time -- back in the 80s -- there was a utility called 'learn' that was a Unix command line tutorial. After each lesson, you could do these exercises where you were dropped into a fake shell, replete with fake directories and that, and had to get things into a certain expected state. They were typical business-related tasks, nothing cool and dungeon-y, but I learned my basic Unix commands that way. It's good to see learning tools like this re-emerge.
Not a game, but smit/smitty[0] built shell command lines that you could review before running them.
It wasn't so useful for me, except for some ksh[1] eccentricities, but I imagine it was (and perhaps still is -- I haven't used AIX in almost two decades) quite useful for novices.
Reminds me a little of one of the games built into emacs... You ftp around and do other stuff that teaches you commands. Not positive, might be called dunnet.
