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: Black Window
Author/Opus: This is the 2nd puzzle from guest contributor Stefan Liew. (This particular puzzle was an early and noteworthy puzzle from @stefpuzzle’s daily Castle Wall series that reached 100 total puzzles.)
Rules: Standard Castle Wall rules.
Difficulty: 2.5 stars
Time Standards (highlight to view): Grandmaster = 3:30, Master = 4:30, Expert = 9:00
Note: Follow this link for more Castle Wall puzzles. If you are new to this puzzle type, here are our easiest Castle Wall puzzles to get started on. More Castle Wall puzzles can be found in our beginner-friendly collection Intro to GMPuzzles as well as the larger collection Castle Wall, both by Serkan Yürekli.