Every time I play the game and got stuck after I make a few moves, I have the urge to reset the puzzle back to its original form, then I'll remember her commenting that it's pointless to go back to zero after so much effort have been put in; any progress is an advancement to solving the puzzle.
But I realize, it is not true.
Sometimes, we don't have a choice.
Sometimes, going back to square one gives you a fresh perspective of the whole puzzle and you may just find a different approach that's "correct" to solving it.