Case 3911: Fakes in the Fog by Marty Sears

CASE 3911

Fakes in the Fog

Not graded: we can’t read all its rules yet

Normal sudoku rules apply.
Enter correct digits to clear fog. No guessing is necessary.
In every row, column and box, there is exactly one 'pseudo cell'. The digits 1-9 each appear once in a pseudo cell.
The real value of a pseudo cell is calculated by adding its row number to its column number. Eg: if there is a pseudo cell in r8c5, it has the value of 13, regardless of which digit is in that cell.
On a lavender 'zipper' line, the values of any pair of cells that are an equal distance from the central spot always sum to the value on that central spot.
On a turquoise 'same difference' line, the values of adjacent cells always have the same difference (but this difference may be different for different turquoise lines.)
Values joined by a V sum to 5.