i lent my Nindendo DS to a colleague during the weekend, she wanted to play New Super Mario Bros.. after office hour on Friday my other colleague tried out Mario Kart.. he was playing a course and without realising start motioning to left and right towards where the kart is moving.. but what really impresses me most is that when the kart swerve to the side, hitting the grass, he goes, "ouch.. hahaha..".. i think that is what Nintendo has been trying to achieve.. the fun factor.. great one Big N.. :D.