The Towers of Hanoi Problem
The Towers of Hanoi is one of those great old Chinese mathematical riddles. It's one of those where you really have to think at first, and once you see it the answer seems just too obvious. Anyway, I was teaching the method to solve the problem to one of my students and they just weren't getting it, so I wrote up this pretty little app so you can physically move the blocks from poll to poll (by dragging them with the mouse). It also includes a description of the problem itself. Not much but fun to show people.
Screen Shot - During Game