When I played my downloaded copy of Smash on an original 3DS, it played fine. However, when I transferred to the 3DS XL, an explosion in-game sometimes triggers a freeze. All buttons do nothing, but the background music still plays, and the 3D slider and head-tracking still work. When I close the 3DS and open it again, the screens go blank, but the background music still plays. Ultimately, I have to shut off the 3DS.
A similar problem was reported here: http://www.gamefaqs.com/boards/632937-/71362012
Thanks!