Notpron - The Hardest Riddle available on the Internet
This is another web-based riddle, similar in concept to Python Challenge. But, this one doesn’t require any programming. You will, however, need to be proficient at figuring out subtle clues, lateral thinking and searching for information on the web.
There are a total of 138 levels. Good luck!
September 10th, 2006 at 17:28
[...] A new web-based riddle, similar to Notpron, and the Python Challenge. The goal of the Antiriddle project is to not only entertain those that enjoy intellectual challenges, but also to teach a certain degree of computer literacy and to foster a sense of cooperation in solving an issue. [...]