While visiting the Princesses in Canterlot, Twilight stumbles upon a letter speaking of a puzzle that drove Starswirl the Bearded mad. The puzzle has been studied by all of the geniuses in Equestria but none can solve the box not even the Princesses can solve this mind-numbing atrocity. Will Twilight Sparkle finally solve the box and discover what secrets it holds or will she fall into the depths of madness just like Starswirl?