Fences or Loop the Loop is always has been my favorite puzzle. In fact I like most of the looping puzzles like Cave, Masyu Puzzles etc. Here is the Polygraph puzzle which is very nice variation of Fences puzzle. Hope you will enjoy it.
If you find this puzzle interesting, there is very good variation of this puzzle "Wolves in Polygarph"
"Polygraph" Puzzle Instructions:
Draw a single continuous loop by connecting neighboring dots horizontally or vertically. The clues inside the loop indicate the number of its edges used by the loop. The clues outside the loop indicate the number of its edges NOT used by loop.
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