The well-known mathematical puzzle Towers of Hanoi, written as an exercise in writing in Inform 7.
Towers of Hanoi was created with Inform and has IFID 7FBBFC98-FF1C-4338-B18C-4C363A787EE1. To play a work like this one, you need an interpreter program: many are available, among them Gargoyle
for Mac OS X or Windows; Windows Frotz or Windows Glulxe for Windows.
Or you can play without downloading anything by following the 'Play In-Browser'
on your web browser.