I am not sure if this has been discussed before or not. This test is for Professor Layton and the Miracle Mask game, but I think the steps could be generalized to other games. I am also preparing this for the Animal Crossing New Leaf game so that I could have more than one town. If you have a digital download version, you could back-up your save game file to other storage device (like your PC hard-drive, or another SD-card, or USB flash-drive etc). Here are the steps that I did and worked (I have US version of 3DS): 1. Open your 3DS SD-card on PC (using Windows Explorer) 2. You will see two folders: one is labelled as "DCIM", and another one is labelled "Nintendo 3DS" (this is assuming you only use this SD-card for your 3DS) 3. Open the folder "Nintendo 3DS", and you will see two folders: one is labelled with a lot of hexadecimal numbers [let 's say folder X], and another one is labelled as "Private" 4. Open that folder X, and you will see a folder with a lot of hexadecimal numbers again [let's say folder Y] 5. Open that folder Y, and you will see three folders: (1) folder "dbs", (2) folder "extdata", and (3) folder "title" 6. Open that folder "title", and in my case (US 3DS), I have two folders: (1) folder "00040000", and (2) folder "00040002" 7. Open that folder "00040000", and you will see inside one of the folders with label "000a8500" (this is the folder for US digital version of Professor Layton and the Miracle Mask, I would expect/guess "000a8600" for EU version and "000a8400" for JP version) 8. Inside that game folder, you will see two folders: (1) folder "content", and (2) folder "data" 9. We are very close to the end step, now open folder "data", and inside this folder you will see a file named "00000001.sav" with the size about 128KB. This is the save game file that if you want you could back it up I had tried copying that file to another SD-card, and then continued playing by solving more puzzles, and then saved it, and then re-copied back the older file from the other SD-card, and when I played it again, I was back to the point before solving the additional puzzles. Do not try this yourselves if you are not comfortable with the risks. If you did perform the test, let me know if those steps work for you and what your game version (US, EU or JP). Now, what I would like to test is that whether any players could use other player save game files. Therefore, if any of you are willing to share your save game file (that "00000001.sav" file), that would be a great help.