How do you think of these paths? I would create something like this, think it's optimal at 81, conclude it's a boring level and not publish :P Wow, took me a long time to figure out Man, THIS trick is one I miss every time in so many levels lol. Took me a long time to find. Missed one block on the symmetry though :P That was hard. Found a few 60 and 58 routes Much like others, found the route very hard to spot 2 distinct solutions to fill the last hole Lots of ways to approach this one 
Insights