Puzzle 27 - Slitherlink 6

So, when making logic puzzles, of course you can mess up.  You can either make there be no solutions (Fixing this usually makes a similar-difficulty logic puzzle), or you can make there be multiple solutions (fixing this usually makes a slightly easier logic puzzle because you have to add more information to make it work).  Sometimes, though, when it seems like there's multiple solutions, the extra solution(s) are ruled out by how the rest of the puzzle is designed.  This makes for an extremely hard logic puzzle, because you need to make a long sequence of possible outcomes to see if it's the right solution.

The reason I say this is to explain why this puzzle is so hard.  It's mostly a nice fairly difficult puzzle, but one part will make you pull your hair out.  Good luck.