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stegano 5!!!!!
i wrote an article on this one! http://www.hellboundhackers.org/readarticle.php?article_id=187
hope u get it ;) give god rating! :P
I duno if the same can be done in C++ or some variant, but java has a nice "Robot" class you can use to loop through x,y coords, getting pixel colors, so I looped through every block and got the answer printed out for me in about 10 secs =).
so yeah, make a prog, it's more fun than marking down however many little blocks =)