Shuzzles · ShudokuSunday, 20 September 2026
DiabolicalSwordfish, XYZ- and W-Wings, unique rectangles. Still pure logic — but only just.
28 clues · difficulty rating 430 · 56 logical stepsTechniques: Box/Line Reduction, Hidden Pair, Unique Rectangle, BUG+1Pinch points: 5 (moments with only one move available) · average choices per step 6.4
shuzzles.co.uk/shudoku/2026-09-20/diabolical/