Out of curiosity I visited your first link and played the first dozen+ levels. It's just been bash-fu and occasional man reading/googling. Judging by the subsequent level instructions I went through, there didn't seem to be much more in there. I'm like, if you really want to learn more about shell commands, there are man pages. Admittedly, a game is arguably a good way to tutor a lazy reader. Still, did I miss anything else in there by not finishing the game?