From Matthew Hurst, Data Mining, a post about ‘A Google A Day‘.
With this description:
At the site quiz questions are presented which essentially require long form queries (and often more than one) to solve. By creating such a site, Google is indicating that it wants to train users to leverage what it believes are its strengths and what will be viewed as the emerging area of natural language search.
I started to say this will work for puzzle lovers but then Sudoku was wildly popular so this search game may have a broad audience.
Certainly the “best” training is training the user is does not recognize as training or enjoys, if possible, both.