What makes a mobile puzzle worth coming back to?

I built One Line Puzzle, a mobile game where you connect the dots in one stroke without retracing a line.

I’m curious where people draw the line between a satisfying challenge and a frustrating one. When you get stuck on a puzzle, do you like having a hint, or would you rather keep trying until you figure it out?

If you give One Line Puzzle a try, I’d love to hear which level first made you stop and rethink your route.

Download link:

Android

IOS