This puzzle is really interesting! I played some puzzles in mobile, and it works well in most cases. Vibrating when block edges are really good feature as it gives direct feedback to user.

However, in my phone when the puzzle size is bigger than 10x10, the outline dots of puzzle is out of screen, makes the puzzle unplayable.

Also, I found that system doesn't check the conditions about one single loop without branches, so the puzzle can be solved without making any loop and using only branches.

And when the puzzle newly generared, place any lines to see zeros change to green feels a little bit inconvenient for me.

Anyway, generated puzzle fits with their difficulty setting, and I like to play it with various difficulty and size settings. Thanks for sharing this joyful site!

Hi IHabl502, thank you so much for the detailed feedback! Really appreciate you taking the time to test it on mobile and sharing these specific insights. You're absolutely right about the mobile outline issue when puzzle size gets bigger - that's definitely something I need to fix. The viewport clipping makes larger puzzles much less playable on phones. I'll prioritize getting that sorted out. Great catch on the loop validation too! You found an edge case I missed - the system should definitely catch single loops without branches. And you're spot on about the initial line placement feeling a bit jarring when everything suddenly turns green. These are exactly the kind of real-world testing insights I was hoping for. It's so valuable to hear from someone who actually played through puzzles rather than just clicked around briefly. I'm working on updates to address these issues, and your feedback will definitely help make the experience much smoother for everyone. Thanks again for giving it a proper test and for the encouraging words about the concept!

Hi, I have fixed some of the issues. Thanks for your feedback.