• Normal Sudoku rules apply.
• There are exactly three non-overlapping 3x3 magic squares somewhere in the grid (each containing the digits 1 to 9 such that every row, column and main diagonal have the same sum).
• A gold cell contains its position within its row, column or box (in normal reading order).
For example the gold cell R5C9 contains either 9 (position in row), 5 (position in column) or 6 (position in box).
• All possible gold cells are given.
For example the white cell R3C2 does NOT contain 2 (position in row), 3 (position in column) or 8 (position in box).
Solution code: row one
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