Walkthroughs for custom maps.

There are many options in this battle, but in my opinion, it is obvious that the best possible configuration is to stand behind a single wall for 1 turn, forcing the champions to stay in place (which reduces the number of starting positions from 70 to 5), so that by the 3rd turn, you can burn through the champions with 2 walls at once.

But this is not obvious at all! And this is precisely an example of a good hint, and this is exactly what is sufficient!
Because it immediately eliminates many branches of development: the combination of unit position + wall placement reduces the number of options not from 70, but from 2100 to 5. This is the problem, oh my god, the author assumes this is obvious! Why could this be obvious? When you have a fast-flying unit + tactics, why would you need to wait 1 turn behind a single wall? By the way, at first glance, I don't understand what changes, but this is precisely a reason to think.
And this is exactly what should be in the hint. Currently, what is in the hint is very thick trolling.
I had many options where 2 stacks were burned in the first 2 turns, and almost succeeded with an option involving waiting, with the speed and burn artifact removed, starting from the very first round. Why does the author think that the two-stack option is an obvious wrong approach? On the contrary, it is the fastest possible and least mana-intensive way to win. It doesn't even involve hiding behind a single wall. Currently, the problem with it is that you lose 1 unit. But why is it obvious that in the remaining 1.4 million possible actions in 2 turns, you won't get the desired outcome?

This is a surprisingly clear example of the curse of knowledge and the blindness of analyzing the solution space. It's a criticism, but it's a normal phenomenon that someone couldn't look at the problem with an unbiased perspective – it's really not easy.
I can give an example so that you can feel what it's like from the other side:
many people can solve quadratic equations. It turns out that this knowledge is enough to solve cubic equations. There is a very simple approach, no additional knowledge or skills are needed; you just need to do a couple of simple operations, and the cubic equation will be reduced to a quadratic one. Can you figure it out on your own? I, for example, would never have guessed, but it's brilliantly simple.