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  3. Harder difficulty chess puzzles

I remember a feature on the mobile app where it allows you to set the difficulty on the chess puzzles. This isn't on the browser version is there a reason for this?

That must have been a long time ago, the function doesn't exist anymore.
The reason is maybe this:
lichess.org/blog/WDY6cCEAALYi5Xg2/puzzles-update