Castle Wall by Stefan Liew
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
Solution: PDF and solving video.
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.
Every once in a while there’s a puzzle on here that reminds me of why I like this site so much better than other logic puzzle sites. This is one of those puzzles.
Castlewall with only black cells needs to be a genre! Never realized there’d be so much depth to it, and it was such a pleasant surprise!
This is a really cool puzzle. Has a different feel to most Castle Walls. It’s fascinating too that once you figure out how it works, it solves so smoothly.
Stellar puzzle! Gubhtu V’z abg fher vs V whfg fbyirq n pnfgyr jnyy be fbzrguvat ryfr ragveryl.
This was just marvelous.
Adding my voice to the positive reviews. Very fun, unique puzzle. Ybgf bs nzovthvgl evtug hc hagvy gur raq.