No kidding, you'll get 500 rather than 250 stars if you register Mario Tennis Open on Club Nintendo before the 28th May.
Source:
http://www.nintendo-gamer.net/2012/05/23/buy-mario-tennis-open-this-weekend-and-get-extra-club-nintendo-stars/
It's a pretty neat deal isn't it?
Source:
http://www.nintendo-gamer.net/2012/05/23/buy-mario-tennis-open-this-weekend-and-get-extra-club-nintendo-stars/
It's a pretty neat deal isn't it?