The phrase "a hidden way" is correct and usable in written English.
It can be used to describe a method or path that is not easily visible or known to others.
Example: "The explorers discovered a hidden way through the dense forest that led them to the ancient ruins."
Alternatives: "a secret path" or "an obscure route".
What Bush has done, in a hidden way, is move us in baby steps toward the flat tax".
Michel Sapin, a key Hollande economic adviser, said that Mr. Sarkozy seemed "ill at ease" having to announce higher taxes "in a hidden way".
Since it is likely they haven't seen each other since the night before, doing the dishes is a hidden way for them to spend time together.
This can be a hidden way of using cheap labor from minorities -- and one of the best survival techniques of many corporations today.
It means to me that if you want to write a serious novel, you should not only be out to entertain but you should also, in a hidden way, reflect on the world's justice and injustice, hope and illusion.
More than a third of that new paper was sold by Conseco to the insurance subsidiaries, a hidden way of getting cash up to the parent.
If you'd like to exert a bit more control, there's a somewhat hidden way to make sure your favorite people and pages always appear at the top of your feed.
But Germany is already doing that in a more hidden way, given the new shape and abilities of the stability fund, which the chancellor only reluctantly approved last month.
"It's very easy to think of that Fortress Malta continuing in the modern world, but in a more hidden way.
Finally, we have come to what we found in this study to be a major obstacle to patients' awareness of their disease, namely the insidious way that lung cancer (mostly) and haematological malignancies (occasionally) progress in a slow and hidden way behind other diseases.
The term self-harm broadly describes a range of things that people do to themselves in a deliberate and usually hidden way (1).
