Path of Illumination
To celebrate the Japanese release of Angels and Demons, the movie directed by Ron Howard and starring Tom Hanks, YouTube have released a Google Maps competition. The objective of the competition is to find four sculptures at "Path of Illumination" in Marunouchi using Google Maps and Google Maps Street View. Prizes include an Alfa Romeo 159 and a $1000 travel coupon.
Unfortunately the competition is only open to Japanese residents. However that doesn't mean that non-Japanese residents can't play the game and try to find the four earth, wind, air and fire sculptures hidden on the Google Map (you just won't win any prizes).