Star Battle by JinHoo Ahn
or solve online (using our beta test of Penpa-Edit tools)
Theme: Pinwheel
Author/Opus: This is the 19th puzzle from our contributing puzzlemaster JinHoo Ahn.
Rules: Standard Star Battle rules. Two stars per row, column, and region.
Difficulty: 4 stars
Time Standards (highlight to view): Grandmaster = 4:00, Master = 10:00, Expert = 20:00
Solution: PDF; two solution videos are also available here (more complex path) and here (simpler path).
Note: Follow this link for other classic Star Battles and this link for Star Battle variations. If you are new to this puzzle type, here are our easiest Star Battles to get started on. More Star Battle puzzles can be found in The Art of Puzzles, in the books Star Battle by JinHoo Ahn and Star Battle 2 by JinHoo Ahn and Murat Can Tonta, and in our beginner-friendly collection Intro to GMPuzzles by Serkan Yürekli.
It took me around 20 mins to solve this one. However, by watching the simpler steps in the solution video, one can solve this puzzle very quickly.