I love this app. Really elegant concept. The number of tangled lines can be instantly changed by algorithm to more or fewer depending on how much of a challenge is wanted.
Only wish is that I could have a paid, ad-free version. Can’t access a menu. If I click the door icon, it exits completely; the hamburger menu allows for number of strings/lines adjustments... but no buy option. The bigger issue with the ads is the same with games— when the puzzle is completed, the game IMMEDIATELY exits to an ad, before you can see what you did correctly. Annoying, but I’m not a developer and maybe that can’t be helped.