Puzzle #300 - Colorblind Loop

For my 300th puzzle (wow I made it to 300 yay!) on this blog, I'm sharing the second half of my secret solver gift for wen, called Colorblind Loop. It's inspired by Bram de Laat's Four Color Loop, where instead of using 4 loop genres with numbered rooms, I decided to go with 4 loop genres that use black and white symbols. The rules are a little lengthy but shouldn't be too hard to understand as it's mostly just 4 standard genres mashed together.

puzz.link interface      penpa interface

Colorblind Loop: Draw a single non-intersecting loop orthogonally connecting cell centers. Each region obeys one of four constraints, to be determined during solving. Adjacent regions may not require the same constraint. (note that this means a region may satisfy multiple constraints, but only one will be required)

Constraint 1: Black and white circles obey Masyu rules.

Constraint 2: Black and white circles obey Balance Loop rules.

Constraint 3: This region obeys Moon or Sun rules. The region may only be visited once. During this visit, all circles of one color will be touched and all circles of the other color must not be used. Travelling around the full final loop, the color of the circle used in all regions with this constraint must alternate. (no such restriction applies to non-Moon or Sun regions)

Constraint 4: This region obeys Kuroshiro Loop rules. All cells in the region must be used. Any loop segment that enters this region must not turn between circles of the same color, and must turn exactly once between circles of different colors. (this includes visits to the region that do not touch any circles!) The loop may turn or travel straight freely on a circle.

I really like some of the things I managed to fit into this grid, both aesthetically and logically. Total construction and testing time on this was probably about 10 hours, which is a bit less than last year- though some of that was due to making errors last year, while this construction process was surprisingly error free!