Actually, Dessamator, we built a walkthrough when I was at the WMF.  It was called "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.  

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