Gran Turismo 5, the first 20 million selling GT... maybe.

[ZorroX]

No - http://www.vgchartz.com/swlaunch.php?reg1=All&game1=Mario+Kart+Wii+-+Wii&reg2=All&game2=Gran+Turismo+4+-+PS2&reg3=All&game3=Mario+Kart+DS+-+DS&weeks=200

I hope it does 15M+, but 20M just no.

Ok, max:
10M in Europe
3M in Japan
7M in NA???