September 26, 2002 10:15 AM Subscribe
(also known as "Griddlers" or "Paint By Numbers") were invented by Non Ishida in 1987. Originally trying to design pictures that could be created by turning the lights on or off in the windows of skyscrapers, Ishida soon realized that the same principle could used as the basis for a new genre of logic puzzle. Since then, enigmatologists around the world have wasted hours solving them online
and completing entire books
of these elegant brainteasers.