Friday, 14 August 2026

4 puzzles · every one solvable by logic alone

Shuzzles · ShudokuFriday, 14 August 2026

DiabolicalSwordfish, XYZ- and W-Wings, unique rectangles. Still pure logic — but only just.

26 clues · difficulty rating 505 · 62 logical stepsTechniques: Hidden Pair ×2, Pointing Pair/Triple, Box/Line Reduction, Naked Pair, Simple Colouring, Unique Rectangle, BUG+1Pinch points: 10 (moments with only one move available) · average choices per step 7.4

shuzzles.co.uk/shudoku/2026-08-14/diabolical/

Why this is a Diabolical

Swordfish, XYZ- and W-Wings, unique rectangles. Still pure logic — but only just.

Rating: 505
Clues: 26
Logical steps: 62
Pinch points: 10one move only
Avg. choices: 7.4per step
Hardest step: Unique Rectangle

Techniques the solve needs

Every technique, explained →

Difficulty is measured by solving the puzzle the way a person does and watching how hard it pushes back — never by counting blank squares.

Print

Lays out as a proper A4 sheet — grid, difficulty and grading. Your print dialog can save it as a PDF.

Print this puzzleExactly as you see it All four of today'sOne sheet, plus solutions

It prints what is on the grid now, pencil marks and all — so you can take a half-finished puzzle with you. Reveal the solution first if you want the answer on paper.

Timer

00:00