Put the "PICROSS_e9" folder and its contents into the JKSV or Checkpoint saves folder on your SD card, then restore the save on your 3DS.

You should do this BEFORE solving any puzzles or your progress will be lost.

If you've already made progress in e9, you can unlock the bonus puzzles by backing up your save data with either 3DS app, then opening the file "all.dat" in a hex editor. Change the bytes at 0x913, 0x914, and 0x915 from 00 to 01. There should be only 2 more bytes in the file following these ones.

HTW