It was a good idea, but as it happened messing with the left-hand columns proved more fruitful. That led to a breakthrough that got much of the left half of the puzzle, though I got stuck several more times on the way to the finish - ended up taking like 2 hours on this one.
Gotta say the quantity of big bonus puzzles in this title does a lot to make it worth the higher price over the S series.
Gotta say the quantity of big bonus puzzles in this title does a lot to make it worth the higher price over the S series.