I figured since most of you were photoshop gurus I thought I’d share this:
http://www.etienne.nu/imagepuz/
It’s pretty fun, though a tad bit easy. You basically try to make your way through a series of increasingly difficult images that contain the url to the next level.
After finishing the image puzzle, you move on to a code puzzle which i’m currently working on, and then after that, a mathematics puzzle.
NOTE: to do the magic picture level (3), bring your face close to your monitor and also so that your eyes are in line with the center of the picture. now try to look “past” it so you’re not exactly looking at the picture on the monitor. slowly move back concentrating past your monitor and you should start making out straight lines in the picture. if you lose it, start again.