Hi,
Today, as I was going through the weekend slashdot stories, I found a story about a guy called . He calls it quazzle. The same thread has a link to . I got hooked on immediately and I knew I would not be able to do any work today until and unless I solve it. My method was simple. Brute force trial and error :). It took me almost half an hour to get it right. And I'm not sure if I can reproduce it.
Thats why, as soon as I was done, I took a sceenshot. Here it is.
How long did it take for you? :)
[Update: I wrote a program to solve it you can find it here]
Yours Sinerely,