Hard Puzzles - Insight Required

insightrequired.com — The puzzles on this sight require you to figure out not only the answer, but also the way to get there. We've written an example puzzle, so that you can see one way to arrive at a solution. The kinds of manipulations allowed by the rules are nearly limitless--it's your job to figure out what to do. Jun 9, 2008 View in Crawl 4