I have out of regions games but for some reason acnl dose not work...That means your firmware isn't patched to run out-of-region games. If you're using Luma, there's a setting when it is first booting.. press/hold select while booting and tick that option.
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I tried doing this, I think I did it wrong though... so this is what I did: In the luma file I made a new file called "locales" and in it i put something which looks like documents then I named it 0004000000086200.txt and I made it in Notepad and it contains "JPN JP" so did I do it wrong?Do you have a Japanese 3DS? If not, you need to enable something first to be able to play games from other regions. Make sure you have the lastest Luma3DS version and do the following:
The TitleID for Tobidase Doubutsu no Mori, or Animal Crossing: New Leaf JPN is 0004000000086200.
So just create a file with Notepad in luma\locales called 0004000000086200.txt, with the following content:
Then hold Select on boot and enable the language feature and try again.
If you wanted to play Happy Home Designer, that game's ID is 000400000014f000.
PS. There is also an update for New Leaf: 更新データ Ver. 1.1 とびだせ どうぶつの森 (0004000e00086200)