On-line riddle -- very cool, challenging

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I just found Zest, a really cool web-based riddle.

It is a sequence of 39 images. For each image, the challenge is to find the "hidden" word. It sounds simple, and it is, but it is very challenging and (IMO) fun. The first one is pretty easy, but they get more difficult as you progress.


To get a bit more background, check out the hints page. It doesn't contain any spoilers, and gives you an idea about what you should be doing.

So...who's going to get to #39 first?

The first image is here. Once you find the word in the image, replace the word "one" in the url of the first image with the word you just found. Rinse and repeat.

p.s. It says you need Photoshop or GIMP, but really any decent image viewer will do the trick.