diaglo said:edit: if you look at the text i was referencing you will see it is barely a paragraph in the Basic set. yet, with the players and the referee's help it can be expanded to be much more.
I've run the adventure in the Basic Set twice, and both times that Mirror has been absolutely brilliant. It really lends itself to expansion.
You've got to love the line, "She might even invite one of the characters to come into the mirror and keep her company, but if he does so, he disappears and is never seen again." that's fun!
Cheers!