It originally was using a DSi to transfer Sudoku that you could get from the easy Sudoku installer, and I realized that did not work. I then realized I downloaded Four Swords when it came out and I wondered if that would work. I backed up DSi's NAND, transferred Four Swords to my 3DS, and realized, it deletes the save. The only way to do this is if you bought the game or downloaded Four Swords when it was on the DSi shop. After that, you would have to get s save writer (might exist, if it does this might be possible) and you could run the DSiwarehax and get B9S that way.