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#671, November 8 - November 14, 2025:
The Weekly 'Unsolvable' Sudoku Puzzle

by Andrew Stuart
WARNING: This is the Weekly 'Unsolvable' Sudoku, rated above 'Extreme'.
This is currently unsolvable by my solver, except perhaps with trial and error strategies.
Using the solver will not help you. (much).

Archive

Each week a new 'unsolvable' will be published and the previous will be accessible here from this archive section. If you like very tough puzzles, these are for you.
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Supporter Members have access to all these puzzles going back to number 1.

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Saturday 8-Nov-2025

... by: BGH

Basics 34.6
4 @ A6 48.1 (Solves for 4’s in 7 Blocks)
3 @ H5 Solution (Solves for 3’s in 4 Blocks)

Confirmed Dieter & Serban's Solutions

Saturday 8-Nov-2025

... by: Dieter

#671 - initially populated cells: 23 = 28,4%
No solver used.
basics: C4=B3=J7=1; F9=6; F5=7
populated cells: 28= 34,6%
Strategy: Numbers 1,6,2,3,4,7 occur most frequently, combine two cells.
combinations of A4 = (4,5,6,7) and A7 = (3,6,8)
A4=5 solves.

Saturday 8-Nov-2025

... by: Serban

# 671 B3=C4=J7=1 F5=7 F9=6 Basics to 28
1. H5=3 solve
2. A4=5 OR G6 =5 solve
3. A7=6 OR C2=6 OR H1=6 solve
Page created on 03-May-2011, last modified on 30-May-2024.
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