Fishy Sudoku
Fishy Sudoku
Devil Ray puzzles may require X-Wing, Y-Wing & Swordfish techniques. Not for beginners!

To enter a number, click the square and type the number.

To edit pencilmarks, hover the mouse over the top third of a square and type a number to add or subtract it from the pencilmarks.

Red pencilmarks are lone remaining candidates. Click near any red pencilmark to set that square to the red number.

Fishy Sudoku for Friday August 18, 2017.