For me it tend to be more of difficult, but doable. I am beginner.

Mostly it was not helping to improve at my level at all, they were sort of pointless exercises in my level. What helped were chess king exercises apps where you solve simple situations that are not even puzzles.

But they are common in game and made you start noticing opportunities and own mistakes in game. E.g. at super beginner level, you improve a lot.