Here's one place to dip your toe in the puzzle water: http://www.perplexcity.com/promo/1/index.qbuild
But the reason I am blearily hammering at the keyboard at this hour is that there's a somewhat interesting (ok, interesting TO ME) challenge on one of the cards. You can read about it here, but the basic gist is that they have this picture of a guy (below), with some writing that translates (from Japanese?) as "Find Me". Apparantly, the challenge is to do a six-degrees-of-separation search over the Earth for this one guy.
So, I don't know, maybe you're bored at work, or maybe you know a lot of Japanese nationals living in Alsace. Check it out.
It says to paste this into my blog, so here it is:
Have you seen him?