Try the
Befuddlr "unscramble the photo" game.
Choose a photo group from any of the Flickr groups listed, click on a photo and then click on "Befuddle it" to mix it up. It times you while you move the pieces (click and hold with your mouse) back to where they belong.
I chose the zebras in the Photojojo group (cause I thought it would be easy), and found I am very S-L-O-W at this. I'll bet you can beat me!