[This is a repost from our archives with new notes at the top (original post here): The center field of 1’s is a quite unusual slitherlink pattern that became the focus for the whole solve here and a somewhat challenging puzzle. Another property that makes the grid hard is the absence of any 0’s that usually drive a faster solve. I often find myself making Slitherlinks without zeroes as a way to help my puzzles stand out a bit more.]

PDF

or solve online (using our beta test of Penpa-Edit tools in edgex mode where left click+drag draws lines and right click marks X’s)

Theme: All for One and One for All

Rules: Standard Slitherlink rules.

Estimated Difficulty*: 3 stars

Time Standards (highlight to view): Grandmaster = 2:15, Master = 4:00, Expert = 8:00

Solution: PDF

Note: Follow this link for classic Slitherlink and this link for Slitherlink variations. If you are new to this puzzle type, here are our easiest Slitherlink puzzles to get started on. More Slitherlink puzzles can be found in The Art of Puzzles, Slitherlink and Variations, and our beginner-friendly book Logic Puzzles 101.