40. Mario Kart 7 (3DS)
The first of three Mario Kart games on my list, and it's the most recent release. There were a few additions to the series, with the option to customise the set-up of your kart with different parts earned mostly via coin collecting, and also the obvious glider/submarine additions, which were essentially twists on what Rare did for Nintendo with Diddy Kong Racing. Of course it's the tracks that are most important, and I enjoyed most of the new ones, and most of the classic tracks were ones I'd previously loved as well.
My 39th game is a downloadable platformer.