Expert sudoku puzzles @ thesudoku.app

Expert puzzles are designed for experienced sudoku connoisseurs. In addition to the techniques described in easy, medium and hard sudoku tutorials, you will need to apply expert solving techniques on one or more steps.

To assist you in your first steps, we've chosen puzzles that require you to apply only one expert technique on only one step.

Also note that any expert puzzle @ thesudoku.app has only one solution and can be solved solely by logic without guessing.

X-Wing

Simple Coloring

Y-Wing

Swordfish

XYZ Wing

X-Cycles

XY-Chain

ABCDEFGHI
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