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New! Crack the Code: Play the Da Vinci Code Quest on Google.
which links to http://www.google.co.uk/url?sa=t&ct=pro&cd=rppweb%3Aen_uk&url=http%3A%2F%2Fwww.google.com%2Fdavincicode%3Fsource%3Dbrpp and then on to a Sony sponsored website.
Now that is prominent advertising.
He also said that they don't use the Google homepage for commercial purposes as it goes against their Corporate principles. This looks pretty commercial to me, even if it is a competition.
I wonder how much PR juice Sony gets from that link?