Kashish Nadar, 8, Kevin Conklin, 11, and Oswin Nadar, 6, (L-R) play Super Mario Cart 3D World at a Nintendo temporary holiday display showcase at The Plaza, King of Prussia Mall, United State's largest retail shopping space, in King of Prussia, Pennsylvania on December 6, 2014. The 2.7 million square feet shopping destination is owned by Simon Property Group. Picture taken December 6, 2014. REUTERS/Mark Makela (UNITED STATES - Tags: BUSINESS)