According to a gamer's bog here, he tells how he looked on the back of the Killer 7 and noticed that there was a typo.
Instead of www.killer-7.com the box refers punters to the www.killer7.com site. The difference between the two is that one will take you to a Nintendo game site, while the other will take you to a NSFW pron site.
Apparently when Killer 7 was released, the makers were a little slow in getting a website and the killer7 name was cyber squatted. As a result Nintendo will have to be a little more careful as to where they put their hyphens. ยต