Balance Loop by Prasanna Seshadri
or solve online (using our beta test of Penpa-Edit tools in linex mode where left click+drag draws lines and right click marks X’s)
Theme: Antisymmetry
Author/Opus: This is the 71st puzzle from our contributing puzzlemaster Prasanna Seshadri.
Rules: (Standard Balance Loop rules.) Draw a single, non-intersecting loop that passes through all circled cells. All white circles must have equal segment lengths on both sides of the circle before turning. All black circles must have unequal segment lengths on both sides of the circle before turning. Numbers indicate the sum of the segment lengths on both sides of the circle.
Also, see this example:
Answer String: Enter the length in cells of the horizontal loop segments from left to right in the marked rows, starting at the top. If the loop only has vertical segments in the marked row, enter 0. Separate each row’s entry with a comma. This example has the key “11,311”.
Time Standards (highlight to view): Grandmaster = 7:00, Master = 12:30, Expert = 25:00
Solution: PDF
Note: Follow this link for other less common Loop variations.
What a challenge! That puzzle had sustained difficulty throughout.
30:19
This one was tough. It took me 21.31 mins to solve this puzzle. It will be nice to see the solution video on this puzzle from the experts.