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Overall, I would advise against using the strategy of "Let's assume cell is X, and see if it leads to a contradiction". More often than not, the contradiction will come way down the line. I made a mistake at some point in the puzzle, and only reached a contradiction 30 minutes later, with dozens more cells filled in. had to re-do it from scratch essentially, only to then do a mistake later again, and having to roll with fixes "Live" (I made it a rule for myself to not use foresights). That's not to say that trying this every now and again won't be helpful, but as you correctly noticed, most puzzles in the game will only require you to look a few steps ahead, so don't go further than that.
That being said, you can try filling in the board just semi-randomly. This will give you information about which areas are more problematic than they might seem, and which are more malleable. You can then look around those areas and try and logic your way into pushing them forward a bit.
Another tip is to try and use broader strokes. Rather than "If I color this cell X then this other cell would have to be Y" try and doing more general ideas of "if I color this cell black, then this light cell has to travel through Y to connect to the rest of the grid". Admittedly you will still need to think about individual cells, but it's less about solving the puzzle and more about thinking forward to try and find the cell that has the shortest time to a contradiction.
Finally, I realize this only now, but there is a certain... "hidden rule" that might make this puzzle 10 times easier. I recommend checking the star structure underneath the southern edge of Autumn Falls or just look through your Insight Encyclopedia if you want. And if you're too lazy, then click on the spoiler -> The existence of "All light cells are connected" and "all dark cells are connected" at the same time results in a 2x2 checkerboard pattern to be impossible.
To me, this was the hardest puzzle in the entire game, so keep pushing and hopefully you'll get through it all!
I remember that one being a pain. While it's usually good, I found for this puzzle that Foresight doesn't always give you the next most reasonable deduction. That one in particular I also found weird.
The shortest way that I see to determine that a dark cell doesn't work there is that if it was dark, the cell above the 6 would have to be light. If that was light, the cell to the left of that could be dark or light, since nothing else constrains it (it's not cutting anything off, and it isn't in view of any of the viewpoint number cells.
Since the solution must be unique, the cell above the 6 has to be dark, which then forces the cell to its left to also be dark.
If you ever see a situation in these logic puzzles where you're saying "If X is true, Y doesn't matter", then X is false.
Maybe I'm not being consistent because there are some situations where I don't consider meta knowledge cheating. If I see a puzzle on a platform floating in the sky, I know I'm supposed to be able to reach it somehow because they wouldn't put a puzzle there otherwise. If I can get up there with some physics glitch, I'm probably not going to keep looking for the way that I was supposed to get up there.
Going back to the original point, knowing what color a block should be can make it easier to focus only on potential logical paths that will either prove it to be correct or prove the opposite to be false. I've done this before, but always need that second reason other than "this puzzle would have more than one solution otherwise and surely they wouldn't allow that". Like you said, you need to be certain about the ambiguity or this will throw you way off.
Another reason I don't rely on ambiguity is because I heard one of the galaxy puzzles has multiple solutions and figured they might do that trick more than once. I also haven't done all the mysteries yet and some of them might involve solving a puzzle both ways or something.
As a side tangent, I've been doing some thinking and I think you might be able to use mathematical analysis to prove that you never need to use this meta approach to a puzzle. Explanation below might be a bit hand wavy, but in general if only one solution exists under the rules of the puzzle, then if X causes Y to be ambiguous, that means X has to also break some rule somewhere within its sphere of influence. So while X causes Y to be ambiguous, it will also cause Z to be a contradiction. This means that the meta analysis is just the other side of a coin for "Assume X, see if it creates a contradiction" method that is a very common way of finding where and how the rules might be broken. It's just sometimes it's faster to find it cause an ambiguity than a contradiction, but also it's much easier to be deceived into thinking of something as ambiguous when it's actually not
The checkerboard lemma is a really useful trick that you should always be on the lookout for in puzzles that have a paired white/black connection rule. It's something I'd never really considered until this game pointed it out, even though it's pretty easy to prove to yourself once you think about it. I've used a similar trick for a long time for any puzzle involving Nurikabe rules where just the black cells need to be connected, noting that you can never make a fully white chain (including diagonals) that touches the edge in two separate places, which is something this game doesn't explicitly call out as an insight. Realizing that there was a completely local rule that you can apply when both connections need to be maintained was really cool, though.
Additionally, when solved once these puzzles stay solved, meaning that you won't be suckered into re-solving puzzles you've done before, like with every other refreshing puzzle
Nice spot! I missed it completely, although i couldn't find the one at the southern tip of Autumn Falls... care to share a screenshot ?