Impregnable
(Published on 29. July 2026, 00:21 by HalfBakedLunatic)
Impregnable: A fortified position; unable to be captured or broken into.
The Rules:
• Normal Sudoku Rules apply
• Digits along an arrow sum to the digit in the circle
Solve Online here (right-click and open in new tab):
Impregnable (Sudokupad)
Leave a comment and let me know how you like it!
Puzzle by David Workman (aka "HalfBakedLunatic") with Special thanks to Kevin Amaro for the idea!
The Rules:
• Normal Sudoku Rules apply
• Digits along an arrow sum to the digit in the circle
Solve Online here (right-click and open in new tab):
Impregnable (Sudokupad)
Leave a comment and let me know how you like it!
Puzzle by David Workman (aka "HalfBakedLunatic") with Special thanks to Kevin Amaro for the idea!
Solution code: Box 5 (top left to lower right)
Last changed on on 30. July 2026, 00:11
Solved by jmw, jordanza, bansalsaab, Bubbalubba, blueberrypug, xiaozhu, jalebc, bigdave, Saltensity, Chelo, Snookerfan, Elliott810, karen_birgitta, Marshal on Mars, NeroChaos, mbrandtwls, BobAndWeave, Gunkan, ... WenVo, Arheus, Grey, Julianl, slowcloud, BorisTheSnake, Crul, kaiserbykaiser, tuckerbucket, hgfe, sedici, mercierus, Megalobrainiac, abed hawila, abadx, ebulku, Ye Nay Myo Han, deangaudet, kangaroo
Comments
on 8. August 2026, 00:30 by abadx
2.5 stars also. Nice solving path amidst all arrows.
on 29. July 2026, 14:29 by BobAndWeave
That's insane! Took me almost two hours, but I managed to break through the fortified position. Very difficult.
Last changed on 29. July 2026, 13:36
on 29. July 2026, 11:33 by Marshal on Mars
Can you clarify if the gray arrow originating from R5C6 terminates in R6C8? There isn't a visible arrow-tip for it.
edit: I proceeded assuming that it's meant to go into R7C8 and that seemed to work.
--- Yes, that is correct!
on 29. July 2026, 09:13 by Snookerfan
Lovely, also 2.5 stars for me. Thanks!
on 29. July 2026, 04:46 by blueberrypug
very nice, but closer to 2.5 for me
