#675, December 6 - December 12, 2025:
The Weekly 'Unsolvable' Sudoku Puzzle
by Andrew Stuart
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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).
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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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Discussion...
Post an idea here...
... by: Frans Goosens
#675
Combination 2-digits cells
B5=5 No solution, Undo calculation
B5=8 No solution, Undo calculation
B6=2 No solution, Undo calculation
B6=9 Wrong, Undo calculation
B6=2 No solution, Fixed
A6=3 No solution, Undo calculation
A6=9 Wrong, Undo calculation
A6=3 No solution, Fixed
A5=4 Wrong, Undo calculation
A5=9 ( H2=6 ) Solved,
Total solving time is : 83 sec.
Number of logical steps is : 11167
... by: Dieter
#675 - initially populated cells: 29 = 35,8 %
No solver used, solver = brain.
basics: %
populated cells: 29 = 35,8 %
Strategy: Number 7 fully set; numbers 5,1,3,6 occur most frequently, combine two cells.
combinations of J1 = (2,5,6,8) and J4 = (3,5,6,8)
J1=8 solves.
