Quoted from CraZ4Pin:nudging is very easy for larger/stronger folks ... unfortunately young kids don't have quite that strength and thus, don't get to play the game like we think it is meant to be played. That's a shame.
My 8 year old 60 pound son has the GC score of almost 400M on my SM (actually has most of the high scores). You don't need to nudge to have a good game.