RULES : Classic Sudoku rules apply. Additionally, cells containing grey circles will only contain digits 1, 2 & 3. Cells containing grey squares will only contain digits 4, 5 & 6. Cells containing grey diamonds will only contain digits 7, 8 & 9.
Rules: Place a digit from 1 to 9 in each empty cell so that each digit appears exactly once in each row, column and 3x3 outlined box. Clue...
So I found an XY-wing, an X-wing and a hard-earned finned swordfish but after that, I resorted to crude bifurcation. I must have missed something.
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