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or solve online (using our beta test of Penpa-Edit tools; use tab to alternate between a composite mode for line/edge drawing and a shading mode.)
Theme: Think Inside the Box
Author/Opus: This is the 426th puzzle from Thomas Snyder, aka Dr. Sudoku.
Rules: Standard Spiral Galaxies rules.
Difficulty: 2 stars
Time Standards (highlight to view): Grandmaster = 1:30, Master = 2:00, Expert = 4:00
Solution: To be posted on our next puzzle post once live.
Note: Follow this link for classic Spiral Galaxies puzzles on this website and this link for variations on Spiral Galaxies puzzles. If you are new to this puzzle type, here are our easiest Spiral Galaxies Puzzles to get started on. More Spiral Galaxies can be found in The Art of Puzzles 2.
Previous Solution: “Multiples of 3” Kuromasu by JinHoo Ahn: PDF and solving video.