Enterprising 3DS owners have discovered an exploit that will disable the handheld's region-locking.
The 3DS is the first Nintendo handheld family to pose restrictions on all of its games from other regions - meaning that you can't import games from Japan or North America unless you also have a 3DS from the same region to play them on.
Happily, the method does not involve any tampering with the hardware itself - nor does it allow for the booting of pirated game ROMs.
Both the 3DS and Wii U have region-based locks on games. The sole exception is the Nintendo 3DS Louvre Guide, which is region-free.
Eurogamer has contacted Nintendo for comment.