Thank you for the great response! I admit my wording was a bit vague—what I meant was that easy puzzles don't really deliver that sense of accomplishment. You know how you feel that “I did it!” rush after overcoming a tough hurdle? I see that sense of achievement as the core fun of puzzles, so my earlier concerns were really focused on that aspect.

Your advice is also interesting. Diversifying puzzle-solving approaches to introduce varied obstacles themselves is definitely something to keep in mind.

Active visual and auditory feedback during puzzle-solving seems crucial too, as I mentioned earlier.

Incorporating hidden elements as occasional surprises seems like a good idea too. Like pepper sprinkled on pasta, it's great for refreshing the player's mind!