A free program for Android, by Crazy Labs by TabTale.

Developed by CrazyLabs LTD, Neon On! is a puzzle game that just might be particularly satisfying to the detail oriented, as well as those who enjoy organizing, classifying, and even cleaning messes.

In this app, you will be given interesting neon mazes or puzzles – such as a badly tangled up neon cable that you must take out of its self-sabotaging knot. Then you have to connect the ropes to the correct light sources so as to complete awe-inspiring neon masterpieces.

The levels become harder as you progress – which means that in later levels, every move you make has the potential to worsen the situation – and leave your knotted mess in a deeper, more hopeless mess. That is why you really have to think twice before deciding on a move.