This follows up the 'magic Squares for Special Occasions' article which tells you you to create a 4by4 magicsquare with a special date on the top line using no negative numbers and no repeats.

Can you think like a computer and work out what this flow diagram does?

What will happen when you switch on these circular circuits?

Can you set the logic gates so that this machine can decide how many bulbs have been switched on?
This is about a fiendishly difficult jigsaw and how to solve it using a computer program.

This is a complete Logo development system which runs in the Flash Player. It can therefore be used to introduce Logo problems over the web without the need to refer readers to external. . . .

A geometry lab crafted in a functional programming language. Ported to Flash from the original java at web.comlab.ox.ac.uk/geomlab