Actually, Dessamator, we built a walkthrough when I was at the WMF. It was called "guided tours" - https://en.wikipedia.org/wiki/Help:Guided_tours. Never really took off, for some reason, which i found disappointing. I always liked that feature and thought it had promise.
The problem with The Wikipedia Adventure (and I adore Jake, the guy who built it, and provided early feedback) is that it was targetted at a specific age group, and so you had to be OF that age group for it to not feel patronizing, for instance.