Very nice feature, I like it.

I t took me some time to find the tutorial button, tho. Maybe put it somewhere more visible? Or does it start by it's own on new accounts (or even new ages)?
I also second that if you click somewhere else, the tutorial goes away and you have to start the chapter anew. While I can understand the idea behind it (unless it's by accident), it would be nice if the tutorial would remember the location (chapter) it was when you (accidentally) dismissed it.