I don't know how everyone else did the puzzle, but try moving the numbers in rotations of three, that's what I did. For example:
3 --> 15 3
15 4 > 4
Sorry for the awful explanation, but keep trying and take breaks every once and awhile. :)
3 --> 15 3
15 4 > 4
Sorry for the awful explanation, but keep trying and take breaks every once and awhile. :)