User blog comment:Mckrongs/Poll: Monster Hunter 3 G is announced for the Nintendo 3DS. What do you do?/@comment-4722452-20120415145356/@comment-4976561-20120415152809

You don't "Need" it for playing it since there is a digital D-pad on the touchscreen to move the camera around, but is a nice add on none the less for underwater hunts.