is there ever a point where you kind of have to "guess" for a wall? i've had a few puzzles (early ones) where I knew a row needed one more wall so I just put it in the column that had the highest number even though I didn't know for sure that was the spot to put it. it hasn't bitten me in the ass yet but i'm hesitant to keep doing that if it's not intended so i don't fuck an entire solution up