i played through the entire game on expert, so no auto-fade or highlighting, here's what i have to say. play it until the "thanks for playing" level, the rest is pure pain, it's not worth it unless you're into cbt in puzzle form. hour long levels, lines and lines of 1 2 2 1 2 2 1- ah fuck i put an extra square there and it messed up everything there goes 49 minutes of my life. then there's the couple of puzzles with actual dead ends, even with the highlight option turned on.
still, big recommendation if you're a picross maniac
still, big recommendation if you're a picross maniac