... by: Envy E
Following previous posts+6 H4 ( +6 G2 +G B5 ) +6 A1 +3 C2 +5 B1 B2 +5 J9 +9 J4 +4 D4
+7 H4 +7 B9 +5 J9 +9 J4 +4 D4
+9 H4 +4 H4
With D4 set to 4 puzzle is solvable
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#671, November 8 - November 14, 2025:
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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). |
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.Share and Enjoy
Supporter Members have access to all these puzzles going back to number 1.
Discussion...
Post an idea here...Sunday 9-Nov-2025
+6 H4 ( +6 G2 +G B5 ) +6 A1 +3 C2 +5 B1 B2 +5 J9 +9 J4 +4 D4
+7 H4 +7 B9 +5 J9 +9 J4 +4 D4
+9 H4 +4 H4
With D4 set to 4 puzzle is solvable
Sunday 9-Nov-2025
... by: Envy E
With 5 eliminated from J5+6 A4 +4 A6 +9 F6 +53 D5 D6
+6 B5 +23 H5 J5 +5 D5 +3 D6
D5 D6 set to 53
D4 F6 set to 49
Sunday 9-Nov-2025
... by: Envy E
Begin where Solver runs out of known solutions+6 H4 ( +6 G2 +6 B5 ) +6 A1 +3 C2 +5 B1 B2 +5 J9
+7 H4 +7 B9 +5 J9
+9 H4 +5 J4
5 eliminated from J5 & J6
Saturday 8-Nov-2025
... by: BGH
Basics 34.64 @ 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 281. H5=3 solve
2. A4=5 OR G6 =5 solve
3. A7=6 OR C2=6 OR H1=6 solve