Claiming to be "The hardest riddle available on the internet" Not Pron will either piss off or delight you.  Supposedly only 107 people have been 'certificated' for finishing the game, which is also probably the same number of people who have played it and who don't have jobs.  Whatever the case...if you decide to play it be sure to look in places you may not suspect, such as html source code and elsewhere...

click!