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#672, November 15 - November 21, 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 15-Nov-2025

... by: Frans Goosens

#672

Combination 2-digits cells

C4=3 Wrong, Undo calculation
C4=9 No solution, Fixed
C5=2 Wrong, Undo calculation
C5=3 ( D1=3 ) Solved,

Total solving time is : 68 sec.
Number of logical steps is : 7732

Saturday 15-Nov-2025

... by: Serban

# 672 A4=B1=G2=7 D6=5 Basics to 28

1. Number 2 n=2 e=7 N=26 Nc=19 Ns= => E1=2 basics to 58
---1a. XY-Wing-148 [CG7,B9] => A7 <>8 => G7=8 solve

2. Number 4 n=3 e=6 N=17 Nc=13 Ns=13 => H7=4 solve

3. Number 9 n=3 e=6 N=14 Nc=10 Ns=5 => D7=9 solve
Note: C4=J7=9
Page created on 03-May-2011, last modified on 30-May-2024.
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